1 Topic by bijuedathodi (edited by bijuedathodi 2013-10-25 15:20:04)

  • bijuedathodi
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Topic: IMAP VS POP3 on Iredmail

Using CentOs 6+Ldap+latest iRedadmin Pro


we are hosting a domain on iredmail server having almost 400 users.Presently they are using POP3 on outlook ,webmail.If i allow all these 400 users to use IMAP on outlook .Will that create extra load on Server as compared to POP3.Ho many concurrent imap sessions will iredmail handle, i mean is there any limit? Will this slows down the server compared to POP3?

If i am using IMAP over POP3 , will my bandwidth increase?
Is there anyway to Sync Global address book to outlook like in Exchange server (active Sync Tool)?

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Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Supports Amazon S3 compatible storage and custom branding.

2 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
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Re: IMAP VS POP3 on Iredmail

bijuedathodi wrote:

If i allow all these 400 users to use IMAP on outlook .Will that create extra load on Server as compared to POP3.

Sure.

bijuedathodi wrote:

How many concurrent imap sessions will iredmail handle, i mean is there any limit? Will this slows down the server compared to POP3?

iRedMail set the concurrent login process to 500 by default (in /etc/dovecot/dovecot.conf), you can increase it when you need:

dovecot.conf wrote:

    # Process limit.                                                               
    # Increase it if you got similar error message in Dovecot log file:           
    #                                                                             
    # "master: Warning: service(imap-login): process_limit (100) reached,         
    # client connections are being dropped"                                       
    #                                                                             
    #process_limit = $default_process_limit                                       
    process_limit = 500

bijuedathodi wrote:

If i am using IMAP over POP3 , will my bandwidth increase?

Yes. And i believe it won't increase too much with 400 users.

bijuedathodi wrote:

Is there anyway to Sync Global address book to outlook like in Exchange server (active Sync Tool)?

Does this tutorial help?
http://www.iredmail.org/wiki/index.php? … ft.Outlook