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Knowledgebase : Technical Help > IceWarp version 11 > Mail Server (SMTP, POP, IMAP)
 

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...
In case that you want to disable the Anti-Spam filter for mailing lists (admin console Anti-Spam -> General -> Other -> *Do not process with antispam), you have to enable the external delivery for all ML on the server and they will be processed as outbo...
SNMP IN ICEWARP INTRODUCTION SNMP belongs to the communication protocols family and has become widely accepted somewhere around 1993 as a powerful method for TCP/IP networks management. The original SNMP concept designer is the IETF (Internet Enginee...
RELAYSERVER, DNS LOOKUP AND SMTP ROUTING Nowadays , unfortunately, it is not rare for a remote system to reject emails from you. If you check the SMTP logs, you will note that right after you connect to a remote system to send an e-mail, you are disconne...
INTRUSION PREVENTION Intrusion prevention, formerly called tarpitting, is a great feature, which has one main feature of avoiding spam dictionary attacks, where spammers try to send messages to any addresses they have on their dictionary containing thou...
_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...
TOOL.EXE SUMMARY TOOL is directly accessing application to API. So you can set everything and more than in Icewarp Administration console through that. In many cases it's quicker to use TOOL or it's necessary due to function or variable absence in conso...
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...
PERSONALIZING MAILING LISTS SUMMARY A mAILING LIST is a special account consisting of a list of users. To send a message to all the users in the list you need only to send e-mail to the mailing list account. A PERSONALIZED MAILING LIST is the same spe...
CONTROLING THE RETRY INTERVALS IN THE SMTP OUTGOING QUEUE? The outgoing queue for sent e-mails from the Icewarp Mail Server is controlled by: * Delivery retry intervals set in SMTP service -> Retry Intervals dialog * undeliverable warning after X ...
BASIC SMTP TRANSACTION The below SMTP log file represents the communication that happens between the client connection (such as outlook, or web mail) and the Server (Icewarp Mail Server). Each line of the log will show the sending statement from the cli...
_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_...
ERROR MESSAGE WHEN SENDING "WE DO NOT RELAY " SYMPTOMS If you cannot send a message and server's response is _'WE DO NOT RELAY_', the problem is probably that you are not authenticated. SOLUTION Icewarp Email Server provides three main ways for a use...
_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...
This filter is not recommended because most notification messages and some messages from mailing lists are sent with an empty Mail From. To reject such messages you have to create a CONTENT FILTER which will match these messages. Go to the _MAIL SERVI...
There are three colors and two letters which can be shown in ICONS in the SESSION HISTORY. S means the SERVER SESSION (Icewarp acts as receiver) C means the CLIENT SESSION (Icewarp acts as sender) YELLOW denotes an ACTIVE SESSION GREEN denotes a S...