I have not been able to send emails from Win-Pm to my Spectrum account since July 20th using Win-Pm .. I can still receive and download messages as normal. Accd to the error message log the email address I used for authentication is not the same as the address I've sent from. I've redacted my addresses in the log below, but they are the same. Also I can send email using an identical profile from my iphone or using the web-mail site. The problem occurs ONLY with Pegasus (both 4.8 and 4.81). 12:31:58.786: --- 30 Jul 2023, 12:31:58.786 --- 12:31:58.786: Connect to 'smtp-server.carolina.rr.com', timeout 30 seconds, flags 16842753. 12:32:00.005: >> 220 p-impout006.msg.pkvw.co.charter.net cmsmtp ESMTP server ready 12:32:00.005: << EHLO [192.168.1.19] 12:32:00.070: >> 250-p-impout006.msg.pkvw.co.charter.net hello [75.176.152.186], pleased to meet you 12:32:00.070: >> 250-AUTH LOGIN PLAIN 12:32:00.070: >> 250-SIZE 30000000 12:32:00.070: >> 250-ENHANCEDSTATUSCODES 12:32:00.070: >> 250-8BITMIME 12:32:00.070: >> 250-STARTTLS 12:32:00.070: >> 250 OK 12:32:00.077: << MAIL FROM:<XXX@sc.rr.com> SIZE=2244 12:32:01.080: >> 550 5.1.0 <XXX@sc.rr.com> sender rejected. The email address you are sending as must match the email address you used to auth. Please check your SMTP settings. AUP#Out-1500

This is the "Community Discussions and Support" forum for Mercury. I suggest posting in the one for Pegasus Mail.