Cannot send any Plusnet emails
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Re: Cannot send any Plusnet emails
on
31-01-2026
3:11 PM
- last edited on
31-01-2026
3:23 PM
by
Baldrick1
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Good afternoon. I am unable to send or forward e mails from my account - <redacted> - or my elderly MiL's account - <redacted>.
I get the same error on requests to send new or forward existing mails - SMTP Error(550). Failed to set sender. (5.7.1 Unknown sender).
I'd be grateful if someone can help resolve these issues on both accounts.
Thank you.
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Re: Cannot send any Plusnet emails
31-01-2026 4:04 PM
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Good afternoon @safcdl16.
I've just picked up your other post around unarchiving now, and sent you over a private message.
Peter
Re: Cannot send any Plusnet emails
4 weeks ago
- last edited
4 weeks ago
by
Baldrick1
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Task <redacted>.f9.co.uk - Sending' reported error (0x800CCC78) : 'Cannot send the message. Verify the email address in your account properties. The server responded: 550 <redacted>.f9.co.uk> sender domain rejected (blacklisted by local policy)'
Can you help me out here? Can't send emails over SMTP..
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Re: Cannot send any Plusnet emails
3 weeks ago
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Hi there @drtodd
Thanks for coming back to the community.
Do you get this error message with every email you try and send? Could you try sending a test one to your own email, to see if the same happens?
Have you tried running a virus/malware scan on your device and updating your password?
Leanne.
Re: Cannot send any Plusnet emails
3 weeks ago
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No problems with virus or password.
Thanks
Darren
Re: Cannot send any Plusnet emails
3 weeks ago
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Hi @drtodd,
We have raised this for you and should be sorted if you wanted to give it a test.
Alex
Re: Cannot send any Plusnet emails
3 weeks ago
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Thank you very much; my problem is now resolved.
Re: Cannot send any Plusnet emails
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Re: Cannot send any Plusnet emails
Sunday
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can't send any emails from one address only
Has your email account migrated to Greenby ? and if so is the email address in question defined as a mailbox ( or an alias ) ?
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
Re: Cannot send any Plusnet emails
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Re: Cannot send any Plusnet emails
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Not migrated so far.
You mean you've received no email about migration or you've checked by trying to login to www,greenby.com using your Plusnet username & password ?
Just to confirm, you can send email from other mailboxes on the account ?
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Re: Cannot send any Plusnet emails
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Re: Cannot send any Plusnet emails
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Re: Cannot send any Plusnet emails
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What error do you get when trying to send ?
If your email client isnt very forthcoming with the actual error, then try the smtp diagnostic command from the information here https://community.plus.net/t5/Email/Diagnosing-email-server-connectivity-issues-the-guide/m-p/200795...
Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.
Re: Cannot send any Plusnet emails
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