Unable to send invoices anymore SMTP Office365 Win10 standalone pc Accounts 50 V20.0.9.320 TLS/SSL

[psprigs]

Spec as above.

I understand the TLS1.0 1.1 is being discontinued.

Server name: smtp.office365.com
Port: 587
Encryption method: STARTTLS or SSL

Ive tried using smtp-legacy.office365.com as well

Months ago and even a week ago i was able to send email invoices, it failed alot of times but just keep repeating send they eventually sent.

Is there a patch or work around to get this working again rather than upgrading to a newer version?



I get this error in eventviewer

System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed.
at System.Net.Mail.SmtpReplyReaderFactory.ProcessRead(Byte[] buffer, Int32 offset, Int32 read, Boolean readLine)
at System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine)
at System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller)
at System.Net.Mail.CheckCommand.Send(SmtpConnection conn, String& response)
at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from)
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
--- End of inner exception stack trace ---
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Sage.Email.SMTP.SmtpMailer.SendMail(Email email, SendMailOption whenToSend)

Ive done all the usual, disabled all anti-virus/firewall, opened up 587 port to all.

I dont know whatelse to do.

[brucedenney]

I think the issue is your mail provider.

Use a different SMTP server and I expect all will be well.