Mac Mail vs MailEnable SMTP

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KelvinTang
Posts: 14
Joined: Tue Aug 22, 2006 11:25 pm

Mac Mail vs MailEnable SMTP

Post by KelvinTang » Wed Apr 10, 2013 1:52 am

I have encountered an issue with MailEnable and Mac Mail, not sure if anyone else has experienced the same issue (searched forum but can't find anything).

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)
As you can see, the DATA command is followed by a QUIT command 60 seconds later.

Any help is highly appreciated.

KelvinTang
Posts: 14
Joined: Tue Aug 22, 2006 11:25 pm

Re: Mac Mail vs MailEnable SMTP

Post by KelvinTang » Thu Apr 25, 2013 11:24 pm

(bump)

I am wondering if anyone else is experiencing the same issue.

Thanks!

MailEnable-Ian
Site Admin
Posts: 9050
Joined: Mon Mar 22, 2004 4:44 am
Location: Melbourne, Victoria, Australia

Re: Mac Mail vs MailEnable SMTP

Post by MailEnable-Ian » Thu May 09, 2013 6:33 am

Hi,

Do you have a proxy (spam gateway) sitting in front of the MailEnable server filtering the connection? Have you tried an alternative email client on the client machine? Have you tried setting an email client locally on the MailEnable server and connecting locally? Also disable Antivirus email scanners on server and on the client machine that is filtering port 25.
Regards,

Ian Margarone
MailEnable Support

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