All Sent Emails Disappear Immediately After Sending

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@brokenprovider wrote:
I have never had this problem in the 12 years with Comcast until Jan. 2020..all Sent emails disappear immediately after sending. Recipient receives them, but they do not store in my sent folders for even 10 seconds. I checked incoming and outgoing mail server settings and both are accurate.

I logged into my web based comcast email and they are not there either.

I did notice that the sent emails convert to Draft emails with most content missing and the recipient email address and subject line are purged. I work in a field where my sent emails are desperately needed as evidence. I do have virus software installed and download very few apps.

My Inbox is not affected however.
I need these sent emails. Are they retrievable? I am using Android OS.

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What email client are you using?  I am using Thunderbird and sent myself a test message and the email showed up in the Sent folder on both Thunderbird and webmail.  I also checked my Settings in Thunderbird to make sure I had Place a copy in Sent folder was marked.

I have this same problem.  Has there been any solution?  I am using Android on an LG G7 and use the default Email app.  This problem only occurs when I forward or reply to an existing email.  I also noticed that a blank email (containing only my signature) is saved in my Drafts folder in these cases.  If I create and send a NEW email, the message appears in my Sent folder as expected.   This is extremely problematic.