We are using MailEnablle Professional 5.53 on one of our servers. It is hosting around 4,700 domains and 11,000 mailboxes without any issues. However, lately, we have been receiving reports that some users are having issues with sending outbound e-mails with Mac Mail. We have checked with the SMTP log and confirmed that these users have not issues connecting (EHLO) and logging into the SMTP server (AUTH). However after the MAIL and DATA command, there is a 60-second delay and a QUIT command is fired (i.e. without the DATE data-ending command). It is as if the mail server never received the CrLf-dot-CrLf data ending sequence.
The mail messages these users are trying to send are very small, and definitely can be transmitted within 60 seconds.
The following is a sample of the SMTP log:
Code: Select all
04/09/13 15:29:26 SMTP-IN 24B6162D11E943DAB70074593A9371B5.MAI 2232 108.###.###.### 220 xxx.xxx.xxx ESMTP MailEnable Service, Version: 0-5.53- ready at 04/09/13 15:29:26 0 0
04/09/13 15:29:30 SMTP-IN 24B6162D11E943DAB70074593A9371B5.MAI 2232 108.###.###.### EHLO EHLO [192.168.1.66] 250-xxx.xxx.xxx [108.###.###.###], this server offers 4 extensions 138 21
04/09/13 15:29:30 SMTP-IN 24B6162D11E943DAB70074593A9371B5.MAI 2232 108.###.###.### AUTH AUTH LOGIN 334 VXNlcm5hbWU6 18 12
04/09/13 15:29:30 SMTP-IN 24B6162D11E943DAB70074593A9371B5.MAI 2232 108.###.###.### AUTH {blank} 334 UGFzc3dvcmQ6 18 18 yann@*****.***
04/09/13 15:29:30 SMTP-IN 24B6162D11E943DAB70074593A9371B5.MAI 2232 108.###.###.### AUTH ************** 235 Authenticated 19 18 yann@*****.***
04/09/13 15:29:30 SMTP-IN 24B6162D11E943DAB70074593A9371B5.MAI 2232 108.###.###.### MAIL MAIL FROM:<yann@*****.***> 250 Requested mail action okay, completed 43 26 yann@*****.***
04/09/13 15:29:30 SMTP-IN 24B6162D11E943DAB70074593A9371B5.MAI 2232 108.###.###.### RCPT RCPT TO:<support@*****.***> 250 Requested mail action okay, completed 43 31 yann@*****.***
04/09/13 15:29:30 SMTP-IN 24B6162D11E943DAB70074593A9371B5.MAI 2232 108.###.###.### DATA DATA 354 Start mail input; end with <CRLF>.<CRLF> 46 6 yann@*****.***
04/09/13 15:30:30 SMTP-IN 91F54A7A3FA14FFBBC8C01DC40457626.MAI 2232 108.###.###.### QUIT QUIT 221 Service closing transmission channel 42 6 yann@*****.*** Re: SSL Certificate (TicketID: 790339855)
Any help is highly appreciated.