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Founder @ Sendmux.ai (Email Inbox API for AI Agents) & Qubrics.ai (voice-first AI assistant) | Spotzee.com (Marketing automation) | Gotta.blog (Share your thoughts).
Latest from Roshan Jonnalagadda · apis & sending · best inbound email api
Compare the best inbound email APIs for 2026: webhook parsers, sender-first platforms and persistent agent mailboxes, with criteria for picking the right one.
alternatives · lobstermail alternatives
Comparing LobsterMail alternatives for agent email: how Sendmux, AgentMail, Nylas, Resend and Gmail compare on sign-up, sending, routing and pricing model.
alternatives · multi provider email
Compare the best email routing platforms for 2026: forwarding, workspace rules, connected accounts and agent mailboxes with weighted routing, rotation and failover.
apis & sending · per tenant email
What a multi-tenant email API is, how to isolate tenants' inboxes, keys, webhooks and reputation, and what to check before you choose one for your platform.
agents & inboxes · message id vs thread id
Message-ID names one email. A thread ID groups a conversation. See how the two differ, how headers link replies, and how to keep agent replies in thread.
agents & inboxes · event driven email
Event-driven email means your app reacts to events and email itself emits events. See the architecture, the events to handle, and how to make it reliable.
apis & sending · thread reply headers
What the References and In-Reply-To headers do, how to set them when your app replies, and how to handle missing or broken thread headers in code.
deliverability · email return path
The Return-Path header explained: how it differs from From and Reply-To, who adds it, how SPF uses it, and how to read it in a raw email message.
apis & sending · cross mailbox search
How a cross-mailbox search API works, from IMAP's multimailbox extension to EWS filters, plus what to check on scope, limits and isolation before you pick one.
deliverability · smtp helo vs ehlo
HELO vs EHLO in SMTP: what each command does, which hostname to send, how EHLO unlocks STARTTLS and AUTH (including OAuth 2.0), and how to debug failures.
apis & sending · multipart alternative email
How a multipart/alternative email bundles plain text and HTML, why part order matters, how attachments nest, and how to parse it reliably in code or an agent.
agents & inboxes · best email api for crewai
How to add email to a CrewAI crew: native Gmail and Outlook apps, triggers, and custom tools for a dedicated agent mailbox, with a pattern for safe sending.
deliverability · smtp bounce codes
How to handle email bounces in code: read SMTP and RFC 3463 codes, split hard from soft, retry safely, suppress bad addresses and keep your reputation intact.
deliverability · delivery logs email
What a good email delivery log records, how to read SMTP bounce codes, and how to export and analyse logs so your app or AI agent can act on them.
apis & sending · reply parsing automation
How the In-Reply-To and References headers thread email replies, how to build them correctly, and the mistakes that split conversations for agents and apps.
agents & inboxes · best langchain email api
How to give a LangChain agent email: the Gmail toolkit, IMAP, connector platforms and a dedicated agent mailbox, plus approval gates and a CrewAI note.
apis & sending · domain based routing
Domain-based routing means two things in email: MX records choose who receives mail, and rules choose where it goes next. Here is how to build both for AI agents.
agents & inboxes · OpenAI email support
Connect OpenAI agents to email with MCP, from read only tools and server implementation to an agent inbox where sending requires owner approval.
apis & sending · webhook hmac verification
Verify webhook signatures with HMAC using SHA 256 over raw request bytes, constant time comparison, timestamp checks, secret rotation, and debugging tips...
apis & sending · SMTP protocol standards
Use the published RFC 5321 as your authority, treat RFC5321bis as a changing draft, and avoid SMTP pitfalls in sessions, recipient handling, and port choice.
apis & sending · triggered email workflows
Route agent email with mailbox APIs, SSE, and signed webhooks instead of basic forwarding. Learn how DNS, rules, parsing, and security fit together.
agents & inboxes · mailbox per customer
Compare aliases, individual mailboxes, and shared inboxes to choose the right setup for access, storage, retention, and email systems built for agents.
deliverability · SMTP server settings
Learn when SMTP port 2525 is a useful fallback, how to configure apps for authenticated TLS, and how Sendmux handles agent mail without SMTP port management.
apis & sending · idempotency key email
Learn how API developers use the Idempotency-Key header to make POST and PATCH retries safe, follow IETF draft guidance, and handle 400, 409, and 422.
agents & inboxes · protonmail bridge imap
For developers searching for a Proton Mail IMAP bridge, Sendmux offers agent mailboxes, scoped credentials, setup steps, and code examples for reading mail.
deliverability · configure MX records for inbound
Configure inbound MX records with tenant hostnames from your provider; check priorities and delivery using dig, nslookup, and telnet before switching DNS...
deliverability · smtp 550 issue
Diagnose and clear SMTP 550 blocked errors with reproducible steps: save the SMTP transcript, inspect headers, and match vendor reply strings to the root...
deliverability · mta sts setup
MTA‑STS for sysadmins: publish the TXT and HTTPS policy, run TLS‑RPT two weeks, set max_age 86,400s.
apis & sending · microsoft graph send email
Examples and working code for sending email with Microsoft Graph. C#, Python and raw HTTP snippets, a 5 step auth and mailbox checklist, attachment rules...
apis & sending · inbound email parsing api
A developer first guide to inbound email parsing APIs: when to use webhooks vs parse calls, mailbox first patterns, scoped keys and Sendmux.
apis & sending · sse vs websockets
Developer checklist to pick SSE or WebSockets. Run a one day spike and log four metrics: connections, memory, reconnect rate, latency. Consider Sendmux...
apis & sending · python email sdk
Developer focused comparison of Python email SDKs, smtplib, IMAP and mailbox first APIs. Learn when to use provider SDKs or mailbox APIs for agents and...
apis & sending · outlook oauth smtp
Developer checklist for Outlook OAuth SMTP: three pre send checks (token audience, Authenticated SMTP, exact UPN), XOAUTH2 formatting, STARTTLS details,...
alternatives · CloudMailin alternatives
A developer-first comparison of CloudMailin alternatives focused on payload shape, attachment workflow, and webhook semantics, plus when Sendmux fits.
agents & inboxes · maildir vs mbox
Decide whether an ephemeral inbox or a persistent mailbox API suits your AI agent. Learn API flows, scoped tokens, and scaling tradeoffs.
deliverability · spf include limit
RFC 7208 based checklist for admins and MSPs to avoid permerror and mail loss. Learn which mechanisms count toward the 10 DNS lookup limit, how to audit...
apis & sending · email to json
Convert raw MIME to validated JSON with a developer focused workflow: prefer schema first parsing, stream attachments to object storage, and follow...
alternatives · gmail api alternatives
Five Gmail API alternatives for developers building AI agents, plus a migration checklist for auth, threading, MIME and deliverability.
strategy · email deduplication
Practical guide for eDiscovery teams: normalize addresses, use SHA-256 body+attachment hashing, and keep custodian metadata and audit logs to make dedupe...
deliverability · smtp dsn codes
RFC and IANA aligned reference for developers to parse, log, and triage SMTP DSN codes. Learn when to retry, which Diagnostic-Code to preserve, and...
apis & sending · best transactional email service 2026
Developer-focused comparison of transactional email services. Learn to read deliverability tests, weigh DX (React Email, SDKs) versus cost, and see when...
deliverability · smtp submission vs relay
Developer guide: map RFCs to production patterns for SMTP submission vs relay. Six decision questions and practical troubleshooting for multi tenant systems.
deliverability · custom domain email setup
Small business roadmap for custom domain email: set DNS, SPF/DKIM/DMARC, test and migrate, and learn when an API inbox is the better choice.
deliverability · email rate limiting
Ops guide mapping Exchange and SES quotas and RFCs to practical controls: stream isolation, token bucket limits, safe retries, and Sendmux signals.
strategy · mailbox storage quotas
Admin guide to mailbox storage quotas: three thresholds, copy ready PowerShell commands, archiving and how agent mailboxes differ.
alternatives · Parseur alternatives
Developers: compare Parseur alternatives by schema enforcement, APIs, OCR support, and throughput. Run a 7–14 day, 20–30 document POC checklist to decide...
apis & sending · email metrics dashboard
Developer-focused, operational playbook for agent mailboxes. Maps six API backed panels to exact endpoints, queries, and alert rules so teams detect...
deliverability · dkim with multiple providers
A compact operations runbook for engineers: four repeatable steps to add and rotate DKIM selectors, avoid selector collisions, and keep SPF and DMARC aligned.
strategy · mailbox migration imap
Enterprise IMAP mailbox migration: preflight dry runs, large mailbox tactics, tool choices, and Sendmux for post migration automation.
deliverability · smtp 421 rate limited
Default to 587 with STARTTLS and keep 465 as a fallback. RFC aware, practitioner steps with OpenSSL and swaks tests and a five minute decision flow.
deliverability · dmarc rua ruf
Engineer-focused guide to using DMARC RUA as your telemetry stream, when to enable RUF, and the DNS, security, and enforcement steps you must run.
deliverability · tls vs starttls
TLS vs STARTTLS for mail admins: when to prefer implicit TLS (port 465/TLS 1.3), how to stop STRIPTLS with MTA‑STS and DANE, and a concise config checklist.
deliverability · gmail sending limits
Sendmux developer brief on Gmail sending limits: Free has a 50/day team cap, Pro's SES is 100/hr and 1,000/day. Learn token flow, routing, and batching to...
deliverability · bounce reason codes
An RFC backed reference for engineers to read SMTP and enhanced bounce reason codes, implement retry and suppression automation, and integrate with Sendmux.
apis & sending · email delivery webhooks
Developer first playbook for email webhooks: verify HMAC signatures, persist and dedupe events, ACK fast and enqueue work. Includes Sendmux inbox and SSE...
deliverability · high volume email
Engineering-first playbook for developers building high volume email for AI agents. Mailbox math, 25 sends/day ramp, 3–4 week warm-up, API primitives and...
deliverability · spf dkim dmarc
RFC aware, step by step deployment for SPF, DKIM and DMARC. Start at p=none with RUA reports, avoid the 10 DNS lookup SPF limit, then move safely to...
apis & sending · gmail labels vs folders
Developer first mapping of Gmail labels and IMAP/Outlook folders into a canonical RFC 9051 mailbox model. Avoid silent deletions and label-limit pitfalls.
deliverability · domain reputation monitoring
Operator playbook to protect inbox placement. Run three quick SPF/DKIM/DMARC checks, add provider dashboards, blocklist polling, engagement telemetry and...
alternatives · mailtrap alternatives
Compare Mailtrap alternatives built for autonomous agents. Find platforms that let agents self register inboxes, use scoped tokens, and run a POC with two...
deliverability · list unsubscribe header
Developer checklist to implement RFC 8058 one click List-Unsubscribe: add both headers, ensure DKIM signs them, use opaque tokens, and test POST endpoints.
alternatives · Knock alternatives
Developer comparison of Knock alternatives. Try Sendmux for agent owned persistent mailboxes, then evaluate Courier, Novu, and migration steps.
strategy · ses vs sendgrid
Developer TCO: compare SES and SendGrid at 100K–1M emails. See the ~$6,000 engineering cost, deliverability work, and a Sendmux mailbox option.
apis & sending · imap vs smtp
Developer focused IMAP vs SMTP guide. Learn what each protocol does, why ports 993/465 vs 143/587 matter, and how to troubleshoot send and sync with a...
alternatives · novu alternatives
Compare six Novu alternatives that put mailbox-first, per-agent mailboxes at the center. Evaluate pricing, MCP support, multi-tenant controls, failover,...
alternatives · onesignal alternatives
Developer focused comparison of OneSignal alternatives that give AI agents real mailboxes. Run the six step POC checklist and verify Sendmux's mailbox,...
apis & sending · proton mail smtp
Learn when to use Proton Mail direct SMTP tokens for servers and when to use Bridge for desktop clients. Never use your regular account password.
alternatives · courier alternatives
Compare Courier alternatives for AI agents and multi tenant platforms. Find providers with mailbox APIs, per tenant reputation controls, delivery routing,...
deliverability · verify email domain
Learn how to verify an email domain effectively with simple commands to ensure trust and security in your communications.
alternatives · sendgrid alternatives
Discover the best SendGrid alternatives for AI agent platforms, including mailbox-first solutions that simplify email infrastructure.
alternatives · nylas alternatives
Discover the best alternatives to Nylas for developers in 2026. Explore options tailored for email access, CRM, and scheduling needs.
agents & inboxes · ai agent mailbox
Discover how an AI agent mailbox enhances autonomy, safety, and deliverability with dedicated addresses and robust API access for better workflow.
strategy · cold email infrastructure
Build reliable cold email infrastructure with strategic mailing practices that maximize inbox placement and enhance your outreach efforts.
alternatives · resend alternatives
Explore the best resend alternatives for developers, from Sendmux to Postmark. Find the right solution for your email needs today!
alternatives · amazon ses alternatives
Explore top alternatives to Amazon SES for developers in 2026, offering tailored solutions for transactional and marketing emails.
apis & sending · best smtp providers
Discover the best SMTP providers for developers in 2026. Choose from Sendmux, Amazon SES, Mailgun, and Postmark for efficient email solutions.
apis & sending · email api pricing
Discover how email API pricing varies by volume. Learn cost-effective strategies to maximize your budget and streamline email delivery.
alternatives · mailgun alternatives
Discover 12 top Mailgun alternatives for developers in 2026, each tailored to enhance deliverability, cost, and transactional workload efficiency.
deliverability · email deliverability monitoring
Master email deliverability monitoring with effective strategies to enhance inbox placement, prevent reputation drops, and ensure seamless delivery.
alternatives · agentmail alternatives
Discover the best AgentMail alternatives for developers, from Sendmux's robust inbox solutions to cost-effective options like Amazon SES.
alternatives · sparkpost alternatives
Explore top SparkPost alternatives for enhanced deliverability, featuring options like Postmark and Sendmux tailored for developers and teams.
deliverability · domain verification email
Learn how to properly verify your email-sending domain using DNS, DKIM, and DMARC for secure and efficient message delivery.
alternatives · Missive like apps
Discover top Missive alternatives for building AI agents with programmable inboxes, featuring Sendmux and more tailored solutions.
apis & sending · best vercel email api
Discover the best email APIs for developers in 2026. Compare features like real mailboxes, parsing, and delivery options to find your ideal choice.
agents & inboxes · how to streamline team inbox
Streamline your AI agents' communication with team inbox management, ensuring reliability and efficiency through API-driven solutions.
strategy · transactional vs outreach
Learn the key differences between transactional and marketing emails. Understand their roles, compliance, and how to optimize your email strategy.
alternatives · Postmark alternatives comparison
Discover top Postmark alternatives for developers in 2026, offering cost savings, enhanced features, and robust routing capabilities to meet your needs.
alternatives · Front alternatives
Discover top Front alternatives for AI agent mailboxes. Explore Sendmux, OpenAgent, and others to find the best solution for your team.
apis & sending · transactional email api
Discover how to seamlessly integrate a transactional email API in three simple steps, enhancing your app's email capabilities today.
apis & sending · batch email sending
Master batch email sending in 2026 with our practical guide. Learn key strategies to ensure inbox delivery and avoid spam filters.
agents & inboxes · ai agent email
Unlock the potential of AI agent email with Sendmux. Empower your agents to autonomously manage emails using an efficient API setup.