Thunderbird Can't Send Email

[MightierPen]

There is other older threads about this but I don't want to necro them.

My Thunderbird can't send email.  It receives email fine.  The internet says it could be antivirus.

This "trusted" thing is confusing.  Of course I don't trust any web address but I need it to work.
I'm not sure what is meant by "trusted".  Will Kaspersky just ignore it?  How can I make it not block the connection but also make sure nothing shady is happening?

I have gmail, proton and outlook accounts in Thunderbird.  Their "domains" all look very common to me, so if I "trust their address" isn't that a major vulnerability?  (Especially outlook, which looks to be a very common outgoing port.)  And is it trusting both outgoing and incoming traffic?  (Outgoing is a lot more likely to be safe than incoming).

I'm also confused as to adding to the exclusion: "A list of websites".  This is the same thing as an SMTP outgoing port?

Anytime I try to send email Thunderbird just sits there not working or else "The SMTP has failed" and I can't send email.  I have no idea what to do.

[harlan4096]

Welcome to Kaspersky Community.

 

Try to add the SMPT server address to Network Settings -> Scan Encrypted Connections -> Trusted URLs list.

[MightierPen]

1 hour ago, harlan4096 said:

Welcome to Kaspersky Community.

 

Try to add the SMPT server address to Network Settings -> Scan Encrypted Connections -> Trusted URLs list.

Hi, thanks for the welcome.  😊

I'm not sure what's the point of a program scanning an encrypted object.  ?
Does Kaspersky have my encryption keys somehow?

I'm not educated on this, but I wish I could trust an application instead of the internet  address.  So that the content is intercepted and scanned but the app itself isn't molested in its operation.  Also my concern is if a bad-actor figures out a certain address is trusted on my computer they could piggyback it, even though it's outgoing.  I might be out to lunch with that, but I dunno.

I'm not even sure if Thunderbird is encrypting messages but probably.  I will look into that.
Today I added the "do not scan encrypted" (smpt address and port) to the exclusions on the security > app manager itself.

I will run some tests and see what is working, thanks for the help.

[AlexeyK]

13 часов назад, MightierPen сказал:

I'm not sure what is meant by "trusted".  Will Kaspersky just ignore it?

In this case trusted connections are not decrypted and scanned by antivirus. Trusted = Ignored.

1 час назад, MightierPen сказал:

I'm not sure what's the point of a program scanning an encrypted object.  ?
Does Kaspersky have my encryption keys somehow?

There is some info in the same article: "If the Scan encrypted connections upon request from protection components option is selected, Kaspersky application uses the installed Kaspersky certificate to verify the security of SSL connections".

Encrypted connections are scanned, password-protected objects in attachments are not scanned. 

There is also an article about mail antivirus.

1 час назад, MightierPen сказал:

I'm not even sure if Thunderbird is encrypting messages

The same article again: "To scan traffic in Mozilla Firefox and Thunderbird, you must enable Encrypted Connections Scan."

Edited 12 hours ago by AlexeyK