Check mail settings for a domain
Enter the domain used for mail. The Hostilla.pl checker will show key configuration elements that affect receiving, sending and message reputation.
What else should be checked?
If the message bounces, the full SMTP bounce is the key evidence. If the recipient says the message is missing, prepare sender, recipient, date, time, subject and message headers if available.
Hostilla.pl can check whether the message was passed to and accepted by the recipient server. If the recipient server accepted it, further filtering usually happens on the recipient side.