Sent e-mail keep showing error after send

Avast Free Antivirus / Premium Security
1

Sent e-mail using Thunderbird keep getting the following error -

“An error occurred while sending mail: The mail server sent an incorrect greeting: concurrent connection limit in Avast exceeded(pass:0, processes:thunderbird.exe[38], PRTG Probe.exe[12]).”"

Any hints for getting this sorted please.

2

Provide details…

3

Win 10 on Dell Laptop

Avast free
Prog version - 20.9.2437 (build 20.9.5758.615)
Definition version - 201216-0
No if definitions - 18,424,588
UI version - 1.0.591

4

Update to the latest version (20.10.2442): https://forum.avast.com/index.php?topic=243196.0

5

Have done this

First e-mail i sent from Thunderbird has same message

6

OK

NO ITS NOT THE SAME ERROR MESSAGE

“An error occurred while sending mail: The mail server sent an incorrect greeting: concurrent connection limit in Avast exceeded(pass:0, processes:thunderbird.exe[27], PRTG Probe.exe[23]).”

!

7
  • OS…? (32/64 Bit…? - which SP/Build…?)
  • Other security related software installed…?
  • Which version/build of Thunderbird…?
8

Win 10 v1909 OS build 18363.1256

No other security

Thunderbird 78.6.0

9
  1. Download Avast Free Antivirus: https://files.avast.com/iavs9x/avast_free_antivirus_setup_offline.exe
  2. Follow instructions: https://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions…!!)
  3. Reinstall Avast with the downloaded installer from point 1.
  4. Reboot.
10

uninstalled and re-loaded yesterday

first e-mail this morning

An error occurred while sending mail: The mail server sent an incorrect greeting: concurrent connection limit in Avast exceeded(pass:0, processes:thunderbird.exe[34], PRTG Probe.exe[16]).

!!!

11

Hmmm, see if this helps: https://forum.avast.com/index.php?topic=231152.msg1529672#msg1529672

12

I don’t believe it will, as Avast has a Concurrent Connection maximum setting (50) and this is what is triggering the issue for info2589.

This used to be in the avast5.ini file and could be increased, now the registry is used.

@ info2589

Check out this topic https://forum.avast.com/index.php?topic=181383.0 it is old and shows the avast5.ini and later in the topic the new means of recording avast settings in the registry and they can be modified. I just wonder if you would have to disable the avast self-defence module before doing this.

Also see https://forum.avast.com/index.php?topic=237546.0 that outlines the new function of saving settings in the registry.

13

OK I’ve disabled IPv6 in Thunderbird
Ill try that first.

14

OK

Removing the Ipv6 does appear to have made an improvement - difficult to quantify.

HOWEVER
First e-mail today

"An error occurred while sending mail: The mail server sent an incorrect greeting: concurrent connection limit in Avast exceeded(pass:0, processes:thunderbird.exe[17], PRTG Probe.exe[33]). "

15

@ info2589
I suggest you read my Reply #11 above as I’m not sure ipv6 has anything to do with the error displayed. Though this part of the error message is strange “The mail server sent an incorrect greeting:.”

Did you install and what are you using this PRTG Probe.exe function for ?
See https://www.file.net/process/prtg%20probe.exe.html if this is network monitoring it is eating up connections leading to exceeding the Avast Concurrent Connection maximum setting (50).

You could try this option first.
Try disabling this PRTG Probe.exe function and see if your sending email works ?

16

Good call Dave.

@ info2589, can you also report what port your SMTP is using?