Sendmail: dmhosting.g.ysm.yahoo.com.: user open
Since a week or two we're getting the following process in our process list:
sendmail: MTA: ./l8RF7j5D011858 dmhosting.g.ysm.yahoo.com.: user open
We've changed nothing on our server.
If i look in our syslog there is a outgoing mail every 10 minuts:
Oct 1 11:32:34 localhost sm-mta: l8RF7j5D011858: to=<email@example.com>, ctladdr=<firstname.lastname@example.org> (514/501), delay=3+18:24:49, xdelay=00:06:19, mailer=esmtp, pri=48723633, relay=dmhosting.g.ysm.yahoo.com. [18.104.22.168], dsn=4.0.0, stat=Deferred: Connection timed out with dmhosting.g.ysm.yahoo.com.
I can't find the cause of this problem.
Searching on internet didn't come up with anything. On internet there is a warning that the mail address dmhosting.g.ysm.yahoo.com often is used to swindle people.
Does anyone know where i can find the source of this problem?
Thank you in advance.