Hello,

In my logs, I see that the host "starttls-virginia.proxy-research.com <http://starttls-virginia.proxy-research.com>" regularly connect to my server and disconnect without doing anything.

To not make it appear anymore in the logs, I tried to block it with this rule in smtpd.conf but it does not work :
match \
from mail-from "proxy-research.com <http://proxy-research.com>" \
for domain $DOMAIN \
reject

Where $DOMAIN is "mydomain.tld".

Where is my mistake ?

That would only reject the mail reception if a sender would try to send mails to *@mydomain.tld with *@proxy-research.com as a sender address. (And even then I believe you would have to at an @ before proxy-research.com) But you stated that the connection doesn't do anything. So the rejection-rule can't apply.

Even if you would use

match from rdns starttls-virginia.proxy-research.com reject

you would still get a log entry. You have to block them with a firewall.

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