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Full Discussion: sendmail : 550 host unknown
Top Forums UNIX for Advanced & Expert Users sendmail : 550 host unknown Post 10376 by Perderabo on Tuesday 13th of November 2001 12:00:18 PM
Old 11-13-2001
It means what it says. Your system tried to contact mailhost.sharkms.ch. It was up but was not listening to port 25. They may have been reconfiguring their mailserver, or maybe the system was overloaded or maybe its mail queue area was full. Anyway, you should be running a sendmail daemon that will retry the mail. These usually go through after a while. Check the mail queue in a few hours.
 

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mailq(1)						      General Commands Manual							  mailq(1)

NAME
mailq - Displays the contents of the mail queue SYNOPSIS
mailq [-v] DESCRIPTION
The mailq command displays a list of messages in the mail queue. The mailq command is the same as the sendmail command with the -bp option; see sendmail for more information. EXAMPLES
The mailq command lists the mail queue as shown in the following example: Mail Queue (1 request) --QID--- -Size- ---Q- Time------- --Sender/Recipient--- AA002508 3 Thu Dec 17 10:01 root The mailq -v command lists the mail queue as shown in the following example: Mail Queue (1 request) --QID--- -Size- -Priority- ---Q-Time---- -Sender/Recipient- AA002508 3 1005 Dec 17 10:01 root (Output might be formatted differently on your system.) The fields have the following meaning: Contains the message queue ID of the message. Contains the number of bytes in the body of the message (header information not included). Contains the priority of the message. Contains the date that the message entered the queue. Contains the user ID of the sender (first), and then the user ID of the receiver of the message. In this example, a message also indicates the status of the message. FILES
Contains the log file and temporary files associated with the messages in the mail queue. SEE ALSO
Commands: sendmail(8) mailq(1)
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