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Old 7 Feb 2019, 01:47 AM   #1
ao1
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Join Date: Oct 2003
Posts: 314
Sending email from Thunderbird very slow

Hello,

When sending email from Thunderbird, it consistently takes 30 seconds to connect to the SMTP server. This is extremely annoying.

Log excerpt:
Code:
2019-02-06 17:25:10.693000 UTC - 1376[3a10140]: SMTP Connecting to: mail.messagingengine.com
2019-02-06 17:25:40.795000 UTC - 1376[3a10140]: SMTP entering state: 0
The same delay happens whether I use mail.messagingengine.com or smtp.fastmail.com

Any ideas?

Edit:
telnet mail.messagingengine.com 465 connects instantaneously

Last edited by ao1 : 7 Feb 2019 at 01:53 AM.
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Old 8 Feb 2019, 04:04 PM   #2
n5bb
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Join Date: May 2004
Location: Irving, Texas
Posts: 8,452
It appears that you are using the old SMTP server and have not switched to using the current smtp.fastmail.com server on port 465 with an app-specific password. See:
https://www.fastmail.com/help/techni...sandports.html

With the current recommended settings I get connections in under 1/2 second. Here are logs showing the start of two message send sessions using Thunderbird 60.5.0:
Code:
2019-02-08 07:48:19.216000 UTC - [53908:Main Thread]: I/SMTP SMTP Connecting to: smtp.fastmail.com:465
2019-02-08 07:48:19.479000 UTC - [53908:Main Thread]: I/SMTP SMTP entering state: 0
2019-02-08 07:48:19.479000 UTC - [53908:Main Thread]: I/SMTP SMTP Response: 220 smtp.fastmail.com ESMTP ready
Code:
2019-02-08 07:59:16.889000 UTC - [43800:Main Thread]: I/SMTP SMTP Connecting to: smtp.fastmail.com:465
2019-02-08 07:59:17.249000 UTC - [43800:Main Thread]: I/SMTP SMTP entering state: 0
2019-02-08 07:59:17.249000 UTC - [43800:Main Thread]: I/SMTP SMTP Response: 220 smtp.fastmail.com ESMTP ready
I am located in the Dallas, Texas, area and using a FIOS high speed fiber optic connection to my Frontier ISP.

Bill
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Old 9 Feb 2019, 01:53 AM   #3
gj15
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Join Date: Jul 2013
Location: Just west of the Greenwich meridian
Posts: 42
This could be symptomatic of your IP address having a reverse DNS problem, discussed towards the end of this thread: http://www.emaildiscussions.com/showthread.php?t=72258
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Old 9 Feb 2019, 07:35 AM   #4
n5bb
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Quote:
Originally Posted by gj15 View Post
This could be symptomatic of your IP address having a reverse DNS problem, discussed towards the end of this thread: http://www.emaildiscussions.com/showthread.php?t=72258
Thatís a good possibility. The Fastmail SMTP server has to do several things before the SMTP transactions used to send a message begin:
  • The preferred server is smtp.fastmail.com over port 465 (SSL/TLS must be activated, but not STARTTLS). The client and server must negotiate the SSL/TLS connection, but usually this is very fast.
  • The client IP address must be accepted. There are block lists for known insecure IP addresses.
  • If the IP looks suspicious (such as not resolving to a reverse DNS), the connection can be greylisted. This will defer the connection with a delay. The client will retry and eventually get connected.
  • Authentication using an application password must be completed.
  • The SMTP server reports that it is ready to accept commands. This is where the email transfer occurs.
Bill
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Old 12 Feb 2019, 09:56 PM   #5
ao1
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Join Date: Oct 2003
Posts: 314
I got a reply from FM's tech support. It's a reverse DNS issue, I'll have to take it up with my ISP.
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