SMTP Reverse DNS mismatch

[mikec]

Over the last two days emails sent to an address that has successfully been receiving emails for well over a year have been returned with error " Client host blocked using dnsbl.sorbs.net " mxtoolbox.com indicates that reverse dns does not match smtp banner and does not support TLS. The web domain is hosted with 123 reg. Any suggestions ?:eek:

[danzil]

Hi

sounds like they have been blacklisted by SORBS.

this maybe due to SPAM or they are configure to be an open relay, (open relay will allow anyone to hitch a free email ride via there email server/provider), that is what you should check first.

check Sorbs website and see if there domain is listed in there database.

regarding the TLS message, what app/ emails server do you use, are you forcing mail to be sent as TLS.

best regards