SmarterMail suddenly failed to send

Question asked by Yee Qi Chuah - 10/8/2017 at 8:23 PM

Unanswered

Hi, I had used SmarterMail 14 since 2 years ago, My mail server cannot send since 3 days ago, all the outgoing mail pending on pools. i tried to restart the services & restart the server, but it still same. May i know there are any way to solve it?

Received: by mail.synsolutions.com.my via HTTP;
	Mon, 9 Oct 2017 10:07:43 +0800
From: "Yee Qi Chuah" <chuahyq@synsolutions.com.my>
To: <e7chuah@gmail.com>
Subject: fdsfds
Date: Mon, 9 Oct 2017 10:07:43 +0800
Reply-To: chuahyq@synsolutions.com.my
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Paul Blank Replied

10/9/2017 at 4:59 AM

For one, something could be suddenly blocking your outgoing SMTP - port 25. You should check into that - it's usually the first thing I check when such a thing happens.

Linda Pagillo Replied

10/9/2017 at 6:36 AM

You may also want to check the DNS servers that you are using in SmarterMail. Try changing them to Google's (8.8.8.8 and 8.8.4.4) or OpenDNS's (208.67.220.220 and 208.67.222.222) servers.

Linda Pagillo Mail's Best Friend Email: linda.pagillo@mailsbestfriend.com Web: www.mailsbestfriend.com Office: 703.988.3606 Authorized Reseller of SmarterTools Products Authorized Reseller of Message Sniffer

Yee Qi Chuah Replied

10/9/2017 at 8:22 AM

Hi, i just tried to update the dns of smarter mail & restart. it still cannot send the email

Matthew Shepard Replied

10/9/2017 at 10:13 AM

Do you use an outgoing gateway, or is it just a one e-mail server deployment? Like Paul said, you may want to check the firewall to make sure port 25 is not being blocked now. What happens when you try to send an e-mail from your domain to your domain? (From chuahyg@synsolutions.com.my to somebodyelse@synsolutions.com.my) This will help show whether it is something in the mail server, or an external factor.

Paul Blank Replied

10/9/2017 at 10:36 AM

Here's the telnet syntax, from a CMD prompt:

telnet <known-good-smtp-recipient-server (FQDN)> 25 [enter]

One good server to test with, and the full command is:

telnet cluster5out.us.messagelabs.com 25 [enter]

The approximate response from this server should be

220 server-7.tower-108.messagelabs.com ESMTP (some of the numbers in that return string may be different)

If you don't get that (if you get a .. cannot connect .. message or some such), you probably have an outgoing email port blocked, either within your network firewall, windows firewall, or it's being blocked by your ISP.

If you do get a good response, then you should check SmarterMail further, and make sure, for one, that your Bindings have not changed.

This assumes that, as Matthew mentioned, you are not using an outgoing gateway; in this case you want to

telnet <gateway fully qualified domain name> 25 <enter> OR

telnet <gateway IP address> 25 <enter> from the CMD prompt.

Also, make sure you have no other SMTP servers running on that Windows server.

You can usually test your SM server's SMTP server directly with

telnet localhost 25 <enter>

(BTW you can then either close the command window or type quit [enter] to get back to the command prompt, leaving that command window open)

*****************************************************

Here's how to make sure your DNS settings are generally good (2 examples), from a CMD prompt:

ping cluster5out.us.messagelabs.com <enter> OR

ping mail.google.com<enter>

Any non-timeout response means your DNS settings should be OK.

Yee Qi Chuah Replied

10/9/2017 at 10:39 AM

i checked the firewall, port 25 is open & i use port check website it also show open

Paul Blank Replied

10/9/2017 at 10:50 AM

OK, but did you run an outgoing test (see my comments below)?

For example, some ISPs may block OUTGOING SMTP port 25, but NOT incoming. And they may do this suddenly, without warning you.

If the outgoing test is good, you need to look further at SM, which is of course why you're here.

Yee Qi Chuah Replied

10/9/2017 at 11:14 AM

Hi. Thx for perfect guide, i tested on my server, the port 25 is failed but port 443 is working. But i triple check on the windows firewall & antivirus fire wall, the port is open

Yee Qi Chuah Replied

10/9/2017 at 11:38 AM

i tried to close the firewall & test send an email, it still failed

Paul Blank Replied

10/9/2017 at 3:17 PM

It appears that the problem is not with SmarterMail. Is this in a residential (residential ISP connection) environment?

Merle Wait Replied

10/10/2017 at 3:53 AM

Perhaps something has been recently installed on the server that is trying to use the same port??
Or, if your port is responding from Paul's instruction on CMD; then it is a firewall.
Also, for grins.. I would temporarily suspend any antivirus processes.. just to test.

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