Can't send email to one particular recipient
I cannot sent email to one specific recipient. I have two accounts, one through gmail and one through AT&T. When I try and sent an email to this one recipient from either account, the File/Send Now function is grayed out. Ctrl-Enter does not work either. This is the only recipient I cannot send mail to. I've sent test email to several other recipients with no problem. Obviously, I'm not getting any kind of 'email blocked' type of message, since nothing is being sent out.
My Thunderbird version is 91.9.0 (32-bit)
Any ideas why this is happening?
TIA for any help.
Chosen solution
It "sounds like" Thunderbird thinks the email address is invalid.
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Chosen Solution
It "sounds like" Thunderbird thinks the email address is invalid.