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unable to authenticate outgoing server

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using thunderbird, cannot send some emails- error message unablr to authenticate outgoing server (SMTP) mail.waitrose.com. I am receiving emails normally and can reply to sent emails.

using thunderbird, cannot send some emails- error message unablr to authenticate outgoing server (SMTP) mail.waitrose.com. I am receiving emails normally and can reply to sent emails.

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I'm going to flag your question for a Moderator to move it from "Firefox" to "Thunderbird".