CEO Mailwarm, email deliverability expert.
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Thami Benjelloun
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May 10, 2026
DKIM is an email authentication protocol that attaches a cryptographic signature to your outgoing messages, proving they haven't been altered in transit. It directly impacts whether your emails reach the inbox or get flagged as suspicious. Learn how DKIM works, why inbox providers rely on it, and how to set it up correctly to protect your sender reputation.
May 8, 2026
IMAP errors happen when your email client can't connect to the mail server, authenticate properly, or sync folder state. Most are caused by wrong port settings, expired OAuth tokens, or mailbox storage limits. Here's how to diagnose and fix each one.
May 6, 2026
IMAP keeps your email on the server and syncs across every device in real time. POP3 downloads messages to one machine and typically removes them from the server. The right choice depends on how many devices you use and whether you need access to the same inbox everywhere.
Apr 29, 2026
A domain gets blacklisted when monitoring organizations flag it for sending patterns that resemble spam. High bounce rates, shared IP contamination, volume spikes, and domain spoofing can all trigger a listing, even for legitimate senders. Most email platforms won't alert you when it happens.
SPF errors occur when your domain's SPF record is misconfigured, exceeds the 10 DNS lookup limit, or contains syntax issues. DMARC treats SPF PermError as a fail, which means your emails get filtered or rejected regardless of content quality.
Apr 8, 2026
SPF (Sender Policy Framework) is a foundational email authentication method that helps verify whether an email is sent from an authorized source. In this guide, we break down how SPF works, why it matters for email deliverability, and how it fits into the broader authentication system alongside DKIM and DMARC.
Apr 6, 2026
A complete guide to SPF, DKIM and DMARC: what they are, how they work, how to configure them, and how to improve email authentication and inbox placement.
Mar 22, 2026
Learn how to improve email deliverability and reach the inbox instead of spam. This complete guide covers warmup, sender reputation, authentication, and best practices to maximize open rates and conversions.
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