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Knowledgebase : Technical Help > IceWarp Version 10 > IceWarp Mail Server Administration > SMTP/Email Delivery
 

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...