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why do I get an error on sent messages after changing ISP using thunderbird

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[Locked as a duplicate of https://support.mozilla.org/en-US/questions/1266044. Please follow up there, thanks.]

I changed ISP from Plusnet to 4Ginternet. I still have a Plusnet email account. Now when I try and send emails using Thunderbird I get this error message:
'An error occurred while sending mail. The mail server responded:
<[REDACTED BY MODERATOR]@btinternet.com> recipient rejected - relay denied.
Please check the message recipient "[REDACTED BY MODERATOR]@btinternet.com" and try again.'
It does not matter who the recipient is; same message.
If I reconnect to the Plusnet router then emails are sent successfully. So nothing in settings has been changed. Similarly using Plusnet webmail page sending emails works.
Who is at fault, 4G, Thunderbird or Plusnet, me?
Very confusing and annoying

[Personal information removed by moderator. Please read Mozilla Support rules and guidelines, thanks.]

''[Locked as a duplicate of https://support.mozilla.org/en-US/questions/1266044. Please follow up there, thanks.]'' I changed ISP from Plusnet to 4Ginternet. I still have a Plusnet email account. Now when I try and send emails using Thunderbird I get this error message:<br/> 'An error occurred while sending mail. The mail server responded: <br/> <''[REDACTED BY MODERATOR]''@btinternet.com> recipient rejected - relay denied.<br/> Please check the message recipient "''[REDACTED BY MODERATOR]''@btinternet.com" and try again.'<br/> It does not matter who the recipient is; same message. <br/> If I reconnect to the Plusnet router then emails are sent successfully. So nothing in settings has been changed. Similarly using Plusnet webmail page sending emails works.<br/> Who is at fault, 4G, Thunderbird or Plusnet, me?<br/> Very confusing and annoying ''[Personal information removed by moderator. Please read [[Forum rules and guidelines]], thanks.]''

Modified by Chris Ilias