Archive for the 'EMail Servers' Category
Viewing 11-20 of 23 FAQ -- Howto: Linux Dovecot Secure IMAPS / POP3S SSL Server configuration :
Q. How do I configure Dovecot IMAPS and POP3s server using SSL certificate? Can I use SSL certificates generated for Postfix mail server?
A. Dovecot is an IMAP server for Linux/UNIX-like systems, written with security primarily in mind. It also contains a small POP3 server. It supports mail in either of maildir or mbox [...] - Postfix setup catch-all email accounts using /etc/postfix/virtual :
Q. How do I setup cacth-all email accounts under Postfix MTA? For example if an email send to me@domain.com, info@you.com and sales@you.com, should be sent to the same email address.
This is useful if anyone of user mistypes an email address when they send it to me, or just guesses at a valid email [...] - Postfix blacklist or reject an email address :
Q. I’ve Postfix based CentOS Linux server. I need to blacklist email ID: user@abadboy.com . How do I blacklist email address with postfix? I also have spamassassin software installed.
A. By default, the Postfix SMTP server accepts any sender address. However you can block / blacklist sender email address easily with Postfix. [...] - Postfix / smtpd : sql_select option missing auxpropfunc error no mechanism available error and solution :
Q. I’m running Redhat Enterprise Linux 4.5 server along with Postfix and Cyrus mail server. However I’m getting following error in my log files:
Jun 10 18:00:04 server postfix/smtpd[7280]: sql_select option missing
Jun 10 18:00:04 server postfix/smtpd[7280]: auxpropfunc error no mechanism available
How do I fix this error? I’m not using mysql for postfix.
A. The cyrus software comes [...] - Linux / UNIX find out size of email account or mailbox :
Q. I would like to show the list of email accounts which used the most disk on my Linux mail server. How do I find out size of email account?
A. Usually mail is stored in /var/mail directory. By running the following command you can get list of email account disk size.
ls -lL will display user [...] - How to Delete Exim Email For A Particular User From Mail Server Queue :
Q. I’m using Fedora 7 server with exim pre installed by someone else. How do I delete email for a particular user from exim queue (like user@dom.com)?
- What is an MX record in DNS entries? :
Q. I see MX record in DNS configuration file. Can you explain the usage of MX record?
A. AN MX is short form for Mail exchanger record. The Domain Name System (DNS) stores and associates many types of information with domain names including
=> IP address
=> Host aliases
=> Email server address etc
DNS server is a general-purpose distributed, [...] - Postfix limit incoming or receiving email rate :
Q. I have noticed that spammers continually try to make a connection (email flooding attack). How do I enforce a number of limits on incoming mail so that I can protect hosted email domains?
A. Postfix (smtpd daemon) can enforce a number of limits on incoming email. This will stop email flooding attacks.
A bot connects [...] - Move or migrate user accounts from old Linux server to a new Linux server :
Q. How do I Move or migrate user accounts to from old Linux server a new Cent OS Linux server including mails? This new system a fresh installation.
A. You can migrate users from old Linux server to new Linux sever with standard commands such as tar, awk, scp and others. This is also [...] - Configure Sendmail SSL encryption for sending and receiving email :
Q. How do I configure Sendmail email server to use SSL encryption for sending/receiving email? I have already obtained or received the required valid SSL certificate. It is stored in /etc/mail/ssl directory as follows:
SSL Keys and Certification files
=> /etc/mail/ssl/sendmail.pem
=> /etc/mail/ssl/ca-bundle.crt
Now how do I configure sendmail for SSL under Fedora Core or RHEL or [...]
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