Configuring SMTP Services
SMTP service settings control how your server sends messages to
other servers, and how it receives messages from other servers and clients.
You configure SMTP services by going to Configuration/Services/SMTP on
the console.
The different configuration settings are organized into the following
6 categories and tabs:
System
General settings for the SMTP system.
Address
completion domain: The "@" part of the message address you want
filled if it is not specified (Default is machine domain)
Local
domains: A list of the domain names the server serves (especially useful
for virtual domains).
Allow
password login: Sets user password login with optional encryption (useful
for Authenticated
SMTP) (Default is on, minimum cipher length 0).
Unix
delivery: Path to an alternative Unix mail delivery program for Unix
Delivery enabled user accounts (Default is /usr/bin/mail).
Program
delivery: A safe User/Group account to run as when delivering
mail to a program (Default is ID of 1)
Accept
Settings for how the server accepts messages from other servers and clients.
Defer
delivery to remote hosts: Prioritizes processing of incoming messages
before delivering outgoing ones.
Verify
each recipient's address: Verifies addresses before accepting the body
of the message.
Lookup
client machine names: Performs host name resolution for all connecting
clients.
Maximum
number of MTA hops: Sets the number of times a message can be
routed between servers before it bounces (stops repetitive looping of bad
messages). (Default is 30)
Minimum
free disk space: Sets minimum free disk space before the server will
begin temporarily rejecting new messages (Default is 49 Kbytes).
Allow
SMTP command `VRFY', `EXPN', `ETRN', `SIZE': Enables dialog commands
to verify user names, verify mailing lists, defer queue processing, and
state message size (Default is all enabled).
Autoreply
Settings for the default text of auto-reply messages, if the account has
activated auto replies but has not specified a reply message.
Default
vacation-mode reply message: Reply when a user is away.
Default
echo-mode reply message: Reply which includes the original message.
Default
reply-mode reply message: Reply to contact the server administrator.
Error
Settings for how the server should handle errors when attempting to deliver
a message.
Methods of handling errors are the following:
a) Return an error message to the sender of the message.
b) Notify the postmaster of the error via email.
c) Log the error in the log file.
Possible error situations are the following:
a) When an address refers to an unknown local account (Default
is all methods).
b) When maximum
MTA hops exceeded (Default is Notify postmaster and Log the error).
c) When disk
quota exceeded (Default is Return message to sender).
Address
Settings for how the server processes addresses.
Envelope
Rewrite Methods: Changes recipient addresses using account attributes
in the Directory.
From
Address Rewrite Style: Changes how sender addresses are rewritten (Default
is "john doe"<jdoe@company.com>).
Alternate
Search Methods: How to re-search if the server can not find a recipient
address in the Directory (Default is Search by user ID (uid)).
SMTP
Routing Table: Delivers messages with certain address domains to specific
servers.
Access
Settings for which users, domains, and IP addresses are allowed access
to SMTP services on the server.
Allow:
Filter pattern of who is allowed access.
Deny:
Filter pattern of who is denied access.
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