SMTP

Simple Mail Transfer Protocol (SMTP) is the standard protocol for sending and receiving e-mail on a Transmission Control Protocol (TCP)/IP network. SMTP provides the ability to send and receive email messages via Standard SMTP Port.

SMTP, SMTP Relay

SMTP Error 550

SMTP Error 550 The SMTP error code 550 means that your requested SMTP action was not completed. Most common reason for getting this error are either: recipient SMTP server is…
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smtp error 550
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