Posts tagged "dns"
4 posts with this tag.
SPF Record Length Limits: The 10 DNS Lookup Rule Explained
SPF records that trigger more than 10 DNS lookups return permerror and break deliverability. Here's why the limit exists, how to count your lookups, and how to fix it.
MTA-STS Explained: Enforcing TLS for Inbound Mail
MTA-STS lets your domain insist that other mail servers use TLS when delivering to you — closing the longstanding STARTTLS downgrade hole. Here's how it works and how to deploy it.
How to Read a DMARC Aggregate Report (the XML, decoded)
DMARC aggregate (RUA) reports are XML files that look intimidating but tell a simple story. Here's how to read one, what each field means, and what to act on.
What is an SPF Softfail? Understanding the ~all Qualifier
SPF softfail (~all) tells receivers an email probably isn't authorised, but to deliver it anyway. Here's what it means, when to use it, and when -all is safer.