Guides to sending email
Answers to the questions that actually come up when you send email: why Microsoft 365 rejects your scanner, what SPF, DKIM and DMARC really do, what an error code means and how to get off a blacklist again. Written for people who need to fix the problem today.
Checkers
Setting up email delivery
-
SMTP relay for Microsoft 365
Why basic authentication no longer works, which three options Microsoft offers and when a dedicated relay is the simpler one.
-
Setting up SPF, DKIM and DMARC
The three standards explained clearly, with the records field by field and a rollout order that does not break delivery.
-
SMTP relay vs. your own mail server
What running your own server really costs once you count the maintenance time, and why the middle ground is usually the best choice.
When email does not arrive
-
Understanding SMTP error codes and bounces
4xx or 5xx, a lookup table of the most common codes and the five cases that account for most bounces.
-
IP or domain on a blacklist
Which blocklist is hitting you, how delisting works and the five causes behind it.
Legal
About the product