I need to fix slowness, crashing and error messages upon sending
Using Mozilla Thunderbird for e-mail was working fine for about a year - then in the last month or so, it became extremely slow to send - often not sending at all - even short e-mails without attachments. I get errors such as not able to save to sent-mail and needing authentication, network issues, etc.
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And your anti virus package is?
Avast