5XX ERRORS IN ICEWARP SMTP
SMTP delivery errors can occur in SMTP session log. You can find them
by checking the LOGS tab from the MAIN MENU > STATUS tab > LOGS.
Make sure that you have your logs set up on debug or exteded logging,
so all the informat...
RETRIEVING MESSAGES FROM ANOTHER SMTP SERVERUSING ETRN/ATRNEXTENSIONS
ETRN (Extended TURN) is SMTP protocol extension for on-demand mail
relay with DNS resolution with fixed IP address. It can be used to
release the load of the destination server by usi...
_OS: Windows; IceWarp Server Version: 11/10_
You will need to check these locations of Icewarp Server
Administration to ensure there is no maximum size set.
Go to DOMAIN & ACCOUNTS > MANAGEMENT and you will need to check per
domain, group, mailing lis...
REVERSE DNS
Reverse DNS is another way of fighting spam. It allows other servers
to check the authenticity of your server.
You will need to know your IP address.
You can look up your IP address using the ipconfig command within a
Windows DOS console...
If you have a spammer sending through you then the first thing you
need to do is secure the server and require all users to authenticate
to the server. This will ensure that at the very least you are able to
see the account doing this in the SMTP logfile....
_OS: Windows; IceWarp Server Version: 11/10_
The UID error is an Outlook error. It happens when Outlook is trying
to synchronize the e-mails.
The UID is a value that the IMAP server and client agree upon that
identifies a particular message. The messa...
SMTP THREADS/CONNECTIONS HUNG/OPEN
If the Icewarp server is experiencing a large amount of incoming
sessions that are not being released, (which fills up the SMTP
connections and halts e-mail from being received), it is neccessary to
turn on a special t...
_OS: Windows; IceWarp Server Version: 11/10_
_PROBLEM_
POP3/IMAP email clients reports problems downloading messages on
Windows Vista.
The mail client doesn't receive anything past the RETR command and the
session times out after a while.
_SOLUTION_...
_OS: Windows/Linux; IceWarp Server Version: 11/10_
If you have problems with SMTP sessions staying open too long, hanging
your server, then follow those instructions:
Enable mail queue logging via command line
Linux : SH TOOL.SH MODIFY SYSTEM C_SYSTEM...
RETRY INTERVALS IN THE SMTP OUTGOING QUEUE
The Outgoing queue for sent mails from the ICEWARP Mail Server is
controlled by:
* file _ICEWARPCONFIGinterval.dat_ (if it exists)
* Undeliverable Warning after X hours
The first attempt at delivery is a...
In version 10 there was an addition called SmartAttach. This feature
allows users to send attachments up to 2GB in size. This is done by
stripping the attachment and caching this in the GroupWare database
and placing a hyperlink into the message for recip...
ANTISPAM
INTRODUCTION
An increasingly common way for senders to send spam is to use the
recipients domain name, or e-mail address as the FROM address
in the sent e-mail. Since the sender is a local domain account this
will bypass most anti-spam ...
Why is my SMTP service restarting?
Problem
In versions 10.1.3 or earlier of IceWarp server, it’s possible to create a domain alias loop which will lead to an SMTP service crash. Consider this scenario: You have a domain alias domain1.com pointing to...
WebClient Delivery reports in IceWarp 10.2.x
Delivery Reports provide you with the status of sent email messages. Information regarding all recipients of any sent email is available.
Users who come from an Exchange environment and are used to one...
If you are having problems sending mail from a mail client such as Outlook, Outlook Express, and Thunderbird when attempting at home or the office it is possible your ISP is blocking the outbound SMTP port (25).
We know most ISP's block outbound SMTP p...
A local Domain is being used to send spam to the server.
An increasingly common way for senders to send spam is to use the recipients domain name, or e-mail address as the FROM address in the sent e-mail. Since the sender is a local domai...
