problem with sending email to reg365 host domains.

[yiwong2001]

Some of our clients complaint they can not receive email from one of our applications. We did a check on mail logs. We found most of them are using reg365 mail service, and issues are pointing to : mx1.reg365.net and mx2.reg365.net.

follows are some of logs:

Aug 7 04:04:07 mail postfix/smtp[928]: BBC2A14C38F: lost connection with mx2.reg365.net[79.140.142.220] while receiving the initial server greeting
Aug 7 04:04:07 mail postfix/smtp[928]: BBC2A14C38F: to=<xx@yyy.com>, relay=mx1.reg365.net[79.140.142.22]:25, delay=51507, delays=51506/0.19/0.78/0, dsn=4.4.2, status=deferred (lost connection with mx1.reg365.net[79.140.142.22] while receiving the initial server greeting)

Aug 7 04:37:27 mail postfix/smtp[16582]: B601F14C324: lost connection with mx2.reg365.net[79.140.142.220] while receiving the initial server greeting
Aug 7 04:37:27 mail postfix/smtp[16581]: E258014C2EC: lost connection with mx2.reg365.net[79.140.142.220] while receiving the initial server greeting
Aug 7 04:37:27 mail postfix/smtp[16580]: 1B1BB118005: lost connection with mx2.reg365.net[79.140.142.220] while receiving the initial server greeting
Aug 7 04:37:27 mail postfix/smtp[16582]: B601F14C324: to=<xx1@yy2.com>, relay=mx1.reg365.net[79.140.142.22]:25, delay=357384, delays=357383/0.03/0.57/0, dsn=4.4.2, status=deferred (lost connection with mx1.reg365.net[79.140.142.22] while receiving the initial server greeting)
Aug 7 04:37:27 mail postfix/smtp[16581]: E258014C2EC: to=<xx1@yy2.com>, relay=mx1.reg365.net[79.140.142.22]:25, delay=268409, delays=268408/0.02/0.66/0, dsn=4.4.2, status=deferred (lost connection with mx1.reg365.net[79.140.142.22] while receiving the initial server greeting)
Aug 7 04:37:27 mail postfix/smtp[16580]: 1B1BB118005: to=<xx1@yy2.com>, relay=mx1.reg365.net[79.140.142.22]:25, delay=272088, delays=272088/0.02/0.67/0, dsn=4.4.2, status=deferred (lost connection with mx1.reg365.net[79.140.142.22] while receiving the initial server greeting)



Anyone has similar issue?

 

[mneylon]

Are those MX records used by all their domains or just ones that are behind some kind of antispam solution?
I've seen some of those services in the past simply drop SMTP traffic on some of their published MX records .. no idea if they're using the same technique