Thanks for the new beta 
Mail shield certificate issue still present with 21.5.6324 (icarus channel).
Hi NON,
can you please send us mail.log for further investigation?
Thanks in advance,
HK
Hi HK, log was sent to FTP. Filename: NON_Mail_log_20210608.zip
Please note I normally use "ignore certificate errors" option on the mail client since this happens.
Last one attempt was logged without that option; having a certificate error.
Thanks for the log. Could you please send the whole support package? Unfortunately, the log does not contain anything suspicious.
Thanks in advance,
HK
Package was sent to FTP: 20210608_1324_IVCCE_2988736846.zip
Thanks NON for the support package. To fix that issue, could you please install the certificate that was used to sign the whole certificate chain of the mail server you are trying to connect to? The reason why you can not connect is that the certificate is signed by unknown certificate authority. In the future release it will be entirely on the application to the decide whether it is ok to connect or not (and warn the user about it).
Best regards,
HK
Hi thanks for analysis, but one of mail server is GMail, and I don't think its chain is corrupted.
Also, without Mail shield there is no problem accessing these mail servers.
Anyway I'll make a repair and (if time allows) Avast reinstall to see what happens after that.