hi every time i try to send email out using my roundcube
it comes out with this error in mautic
[2019-10-10 09:48:40] mautic.ERROR: [MAIL ERROR] Sending failed for one or more recipients Log data: ++ Starting Swift_Transport_EsmtpTransport << 220 box.example.com ESMTP Hi, I’m a Mail-in-a-Box (Ubuntu/Postfix; see https://mailinabox.email/) >> EHLO example.co.uk << 250-box.example.com 250-PIPELINING 250-SIZE 134217728 250-VRFY 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-DSN 250 SMTPUTF8 >> STARTTLS << 220 2.0.0 Ready to start TLS >> EHLO example.co.uk << 250-box.example.com 250-PIPELINING 250-SIZE 134217728 250-VRFY 250-ETRN 250-AUTH PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-DSN 250 SMTPUTF8 >> AUTH LOGIN << 334 VXNlcm5hbWU6 >> c2FsZXNAYW50aWJvZHltYXJrZXRpbmcuY29t << 334 UGFzc3dvcmQ6 >> THluY2gyMDAx << 235 2.7.0 Authentication successful ++ Swift_Transport_EsmtpTransport started >> MAIL FROM: << 250 2.1.0 Ok >> RCPT TO: << 553 5.7.1 : Sender address rejected: not owned by user sales@example.com >> RSET << 250 2.0.0 Ok [] []
[2019-10-10 09:48:40] mautic.ERROR: [MAIL ERROR] Sending failed for one or more recipients Log data: >> MAIL FROM: << 250 2.1.0 Ok >> RCPT TO: << 553 5.7.1 : Sender address rejected: not owned by user sales@example.com >> RSET << 250 2.0.0 Ok [] []
could someone advise?