Hope you can help me, I just created my account in mailspring using IMAP.
But now I am getting this error message pops up whenever I send messages.
“The message has been blocked by Yahoo outbound spam filter”
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Bumping this, it’s very annoying. I’m not even using Yahoo (AFAIK) but Gandi mail. I can’t send emails from this account because this pops up:
Not much use to an email client that can’t send emails 
!