Out of the blue on Friday afternoon our servers emails just stopped. Based on the log file it's still trying to send them, but has been unsuccessful:
Emails: Successful sent: 0 Unsuccessful attempts: 4313 (Warning: Last email could not be sent!)
We contacted our email provider to make sure they weren't blocking our server and they confirmed they are not. We then tried using random email accounts, including gmail, as the sending email account and we continue to get the same errors. Here's an example from the log file. I replaced actual IP addresses and domain names with X's for security purposes. Anyone have any reccomendations?
[8] 2011/02/20 14:30:47: SMTP: Connect to xxx.xxx.xxx.xxx:25
[8] 2011/02/20 14:30:48: SMTP: Received 220 mail.xxxxxxxxxxxxx.com ESMTP Postfix (Ubuntu)
[8] 2011/02/20 14:30:48: SMTP: Send EHLO localhost
[8] 2011/02/20 14:30:48: SMTP: Received 250-mail.xxxxxxxxxxxxx.com
250-PIPELINING
250-SIZE 30960000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH CRAM-MD5 PLAIN LOGIN
250-AUTH=CRAM-MD5 PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
[8] 2011/02/20 14:30:48: SMTP: Send STARTTLS
[8] 2011/02/20 14:30:48: SMTP: Received 220 2.0.0 Ready to start TLS
[8] 2011/02/20 14:30:48: SMTP: Send EHLO localhost
[5] 2011/02/20 14:30:48: SMTP: Connection refused on xxx.xxx.xxx.xxx:25