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503 valid rcpt command must precede data - Email sending error
Sending an email returns a "503 Valid RCPT command must precede DATA"
Unable to send emails through Thunderbird
Microsoft error 0x800CCC1A when sending/receiving emails
0x800ccc0f
Forwarded email bouncing at Gmail with error 550 5.7.1
Domain has exceeded the maximum defers and failures per hour
0x80042108 POP Email error
Reported error (0x80042108): Outlook is unable to connect to your incoming (POP3) email server.
Error: 550 This message was classified as SPAM and may not be delivered
Error when sending email, SMTP server rejecting outbound email with Error : 550 This message was classified as SPAM and may not be delivered
Microsoft Outlook hangs on “Synchronizing Subscribed Folders”