9 Apr
2010
9 Apr
'10
9:01 p.m.
Patrick Giagnocavo wrote:
This DID actually bite my company about 3 years ago.
A customer went to China (usually in NYC) and could not send email through the mail server because they were using POP-before-SMTP instead of the mail submission port .
The problem did not lie with blocking IPs. But with offering a flawed service such as pop before smtp to begin with. I know many ISPs/ESPs still do, much to my chagrin. The only way to submit email should be port 587 with TLS encryption, 3 years ago one could be forgiven for offering deprecated (*) port 465 with SSL, but not anymore (msoft clients have been fixed). Regards, Jeroen http://www.iana.org/assignments/port-numbers * urd 465/tcp URL Rendesvous Directory for SSM