Avast Free deleting my attachments

Occasionally, I to use my mail client to message my phone data/pics etc
Avast has been deleting the attachments.
I turned off the mail shield, restarted and it’s still doing it.

I’m running Avast Free on my laptop with Win7. Claws email.
S5 android phone with no avast(or any issues with attachments to date)

Thanks in Advance,
TomJV

also, can someone please explain or point me to a page that has info on how to use these verification letter things? It always takes me several tries and I often simply give up in frustration.
for instance, are they case sensitive? spaces?

also, can someone please explain or point me to a page that has info on how to use these verification letter things? It always takes me several tries and I often simply give up in frustration.
Forum spam protection, and it is working as we dont see much after this was done. .... and it is only first 3 posts

What OS/SP ?
What exact version of avast ?
Any other security (related) software installed ? (or was there)
What is telling you it is avast that removes the attachments ?
In what format are the attachments ?

What OS/SP ? > win7
What exact version of avast ?> 2015.10.2.2218
Any other security (related) software installed ? (or was there)> negative
What is telling you it is avast that removes the attachments ?> message text in the email body
In what format are the attachments ?> mixed, usually PDF or JPG

Thanks TomJV

You are using a old version of avast.

Perform a clean installation of the latest avast version :