Undelivered mail message
My Thunderbird e mail is sending me Undelivered Mail Returned to Sender
when I try to send an email message.
My Thunderbird e mail is sending me Undelivered Mail Returned to Sender
when I try to send an email message.
Opaite Mbohovái (1)
That isn't necessarily a problem. Possibly the email is undeliverable. You chose to provide no information, so that's the best advice I can give.