550 sender is not allowed

List of common error reports for Linux email servers-Linux Enterprise applications-Linux server application information. For details, refer to the following section. Server 400 Error Report Q: 421 Server too busy A: Unable to connect because the

Recently in the mail to send the interface to the problems encountered and solutions to tell you want to know the message to help people The original program part of the code is as follows Set mail message sender address, recipient address,

1. Introduction The goal of Simple Mail Transfer Protocol (SMTP) is to transmit mail reliably and efficiently, which is independent of the transfer protocol.The delivery subsystem only requires a channel that can ensure the sequence of transmitted

 Table (1) SMTP CodeCode definition421 service not available, hosts in the closing transmission channel brackets cannot provide normal services, close the transmission pipeline, and emails will be stuck on the host450 requested mail action not taken:

From: Author: (2001-11-2307: 08: 00) 1. the goal of the Simple Mail Transfer Protocol (SMTP) is to deliver mail reliably and efficiently. it is independent of the transfer subsystem and requires only one channel that can ensure the order of

From: Author: (2001-11-2307: 08: 00) 1. the goal of the Simple Mail Transfer Protocol (SMTP) is to deliver mail reliably and efficiently. it is independent of the transfer subsystem and requires only one channel that can ensure the order of

Simple Mail Transfer Protocol (SMTP) 1.Introduction The goal of Simple Mail Transfer Protocol (SMTP) is to deliver mail reliably and efficiently. It is independent of the transfer subsystem and requires only one channel that can ensure the order of

 Common error code for sending emails[Posting] Q represents a question and a represents a question.Q: The server says: 550 relaying mail to <> is not allowedQ: The server says: 550 <>... relaying deniedQ: The server says: 550 5.7.1 relaying not

Simple Mail Transfer Protocol (SMTP) 1. introduce The goal of Simple Mail Transfer Protocol (SMTP) is to deliver mail reliably and efficiently, independent of the transport subsystem and requiring only one channel that guarantees the order in which

Letter of Return code description:421hl:reptheIPthe sending behavior is abnormal, there is a large number of recipients does not exist, is temporarily forbidden to connect. Please check if any users send virus or spam, and check the validity of the