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Blogs
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Deliverability
Why Are My Emails Going to Spam? Fix Email Deliverability in the Right Order
The order you check email deliverability problems in decides how fast you fix them. Start with the layer that broke, not with the DNS zone.
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Deliverability
SMTP vs Email API vs Self-Hosting: Which Should You Use for Transactional Email?
The three routes for sending transactional email differ less in code than in ownership. Here is who ends up responsible for IP reputation, rDNS, bounces and your DNS records, and why the DMARC reporting layer is never yours alone.
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SPF
What Does an SPF Result Mean? Pass, Fail, Softfail, Neutral, None, Temperror and Permerror Explained
SPF has exactly seven defined results. Only one of them counts for DMARC, and the other six mean very different things. Here is what each one actually tells you.
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Deliverability
Do Spam Trigger Words Still Matter? A Practical Email Deliverability Guide
An isolated trigger word is not a reliable reason for spam placement. Check authentication, reputation, list quality and the whole message before rewriting copy, then test one change at a time.
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Deliverability
Spamhaus Sender Guidelines: What Every Sending IP Needs From November 2026
Spamhaus starts enforcing valid HELO, PTR, and matching A records for every sending IP in November 2026. Here is the per-IP audit plan.
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Deliverability
How to Appeal a Gmail Spam Classification With Postmaster Tools and the Sender Contact Form
Gmail has no per-message spam appeal. Here is how the bulk sender escalation and Postmaster Tools delivery issues form work, what evidence to attach, and when you are automatically ineligible.
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SPF
Can a Domain Have Two SPF Records? What Happens When You Add a Second One
A second v=spf1 TXT record makes SPF evaluation undefined for every sender on the domain. Here is how to find the duplicate, merge it into one record, and stop the next tool from adding another.
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DKIM
Unknown DKIM and SPF Records in Your DNS: How to Identify Them and Remove Them Safely
A DKIM or SPF record you did not create is still a standing permission to send as your domain. Here is how to identify the service behind it, tell a dead record from one that changed hands, and remove it in the right order.
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BIMI
Why Your BIMI Logo Disappears When Your VMC Certificate Expires
An expired Verified Mark Certificate is the usual reason a BIMI logo stops rendering while every DNS and DMARC check still passes. Here is how to read the expiry date, what actually breaks, and how to stop it recurring.
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DMARC
Do Subdomains Count Toward Gmail's 5,000-a-Day Bulk Sender Threshold?
Gmail counts every message from your primary domain toward the 5,000-a-day limit, subdomains included. Here is what changes when you cross it.