Hi, I have the problem that I can not send emails when Avast protection is enabled. Also, there is a problem when using Imap, so email drafts are not saved either or getting E-Mails does not work. I was able to specify the problem in more detail. I herefor ask Avast to solve the problem. Thanks
Basic setup
New installation of Windows 10 22h2
Thunderbird version 68 or 115 (latest).
All email inboxes Yahoo & Google, makes no difference.
On my other computer with the same settings, same Windows 10 Installment, the “Send Email” function works and I get no error messages & sending works.
Error Text in Thunderbird:
Message could not be sent.
The message could not be sent because the connection to the SMTP server smtp.mail.yahoo.com failed. The server is either unavailable or refuses SMTP connections. Please check the SMTP server settings and try again.
Or:
Sending the message failed.
The message could not be sent because the connection to the SMTP server smtp.mail.yahoo.com exceeded its expiration time (timeout). Try again.
Same Error with gmail Mails.
Tests & Trials:
already fresh Windows 10 Pro installment
Reinstall Avast, deleting all Appdata stuff and registry cleaning with Glary Utilities
Turn off all Avast modules 10 minutes, email sending no problem.
Geek:Area settings are exactly the same on both of my computers (default)
Geek:Area certificate is already installed says Thunderbird v. 68 & 115 too
Thunderbird account settings are identical on my machines (mails, ports, imap etc.). Thunderbird Version does not matter.
Solution: Disable “Scan Outbound Mails (SMTP” does not solve the problem!!
Testing: The problem already occurs when Avast E-Mail Protection is enabled in Avast Settings (Menu - Settings - Protection → Core Shields → Enable Mail Shield [Block Attachments]), the rest was unchecked by myself!
I thank you already for feedback to solve this.
Regards
So, I have reactivated Email Protection in Avast settings. I also disabled/enabled/disabled the “Enable Mail Shield [Block Attachments]” setting for 10 minutes while I was doing email sending tests between Yahoo/Gmail addresses, which I own.
Without “Enable Mail Shield [Block Attachments]” E-Mail goes through normal
With enabled Mail Shield [Block Attachments] I get Timeouts, so E-Mails does not go any/all time in my tests
Avast current updated, enabled debu logging (silent mode does not matter)
Thunderbird 115.3.1
NordVPN with connection on/off (doesn’t matter) → Tested this because Custom DNS on/off → This Custom DNS is only Quad9 9.9.9.9 → NordVPN is not the cause of the error, which I briefly suspected during my tests.
Thank you. Regrettably, this file was not delivered to our FTP for some reason. Could you please upload it manually? The steps are described here: https://support.avast.com/en-ww/article/160/
The ZIP file with logs is in the following directory: C:\Users%username%\AppData\Local\AvastSupport
To access this directory, you can press Win+R, paste %LocalAppData%\AvastSupport and press Enter.
I do have ver. 23.9.6082 - build 23.9.8494.796.
And as I wrote “Scan inbound emails (POP3, IMAP4)” and “Scan outbound emails (SMTP)” was not the problem.
The setting “Enable Mail Shield [Block Attachments]” was noticeable with my Timeout problem.
Do you happen to have another application installed that could block traffic? Mail.log from support package says that connection to SMTP server time-outed, that means another app blocked the connection. It could be FW or any other security app.
No I don’t have other antivir, even not win defender.
Problem still exists sometimes. I experienced that NordVPN connection is also a part of the problem. Else also without NordVPN the Problem has occured.
Also, on my second PC (Laptop) all was working with same avast & nordvpn connection.
So as I said before.
The Avast tick at E-Mail Protection is causing my problem with the smtp timeout, with or without NordVPN connection.
Besides the SMTP-Server Timeout I also could not update incoming E-Mails with Thunderbird btw.
I did change nothing. The where two Windows 10 updated since first post. Also as you heard I am using NordVPN.
Avast Settings arent default, since my second post:
Protection - Core Shields - E-Mail
yes Enable Email Shield
yes Scan Inbound
yes Scan Outbound
yes Add Signature
no Mark Subjekt
no Scan Attachment MS Outlook - I dont use Outlook
yes Generate Report
I also never expierenced this kind of Issue. I use Avast since 2010 or so.