Every minute incoming, rejected connections to SMTP

Posted by joltmode on Super User See other posts from Super User or by joltmode
Published on 2013-11-05T21:23:46Z Indexed on 2013/11/05 21:57 UTC
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Filed under:

email

|

smtp

|

postfix

I have a feeling my server is being lazily DDoS'ed, though, I have never experienced it before, so, I may be wrong.

Every minute, my journal logs the following 3 entries:

Nov 05 21:10:47 <host> postfix/smtpd[11220]: connect from webmail.onvoy.com[199.199.18.10]
Nov 05 21:10:47 <host> postfix/smtpd[11220]: NOQUEUE: reject: RCPT from webmail.onvoy.com[199.199.18.10]: 454 4.7.1 <tg@<DOMAIN>>: Relay access denied; from=<> to=<tg@<DOMAIN>> proto=ESMTP helo=<webmail.onvoy.com>
Nov 05 21:10:47 <host> postfix/smtpd[11220]: disconnect from webmail.onvoy.com[199.199.18.10]

Where <host> and <DOMAIN> are hidden. <DOMAIN>, though, is a domain registered with my NS that resolves to my box.

How do I get rid of the messages and the related connections?

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