03-09-2016
Email Server High Availability
Hello,
We are planning to setup a Email server with High Availability for email services so that if SMTP/POP/IMAP goes down on one server, the services switch to second server.
We are planning to use a Linux machines from a hosting provider and will do it using DNS with multiple MX records with round robin.
Now i have couple of queries regarding this setup :- - Is this possible to have a same domain name to bind with 2 IPs i.e xyz.com point to 1.1.1.1 on one server and xyz.com point to 2.2.2.2 on second server.
- How can we setup MX records for each server on DNS for email failover.
- As we have a separate servers for this setup that means data related to email would be reside on separate server (because they have separate HDD), so in case 1st server goes down and it switch to second server, will i skipped my email which was received on 1st server before it goes down as my email client will receive them on certain period of time.
Please let me know if above is a valid query.
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LEARN ABOUT SUSE
calibre-smtp
CALIBRE-SMTP(1) calibre CALIBRE-SMTP(1)
NAME
calibre-smtp - part of calibre
SYNOPSIS
calibre-smtp [options] [from to text]
DESCRIPTION
Send mail using the SMTP protocol. calibre-smtp has two modes of operation. In the compose mode you specify from to and text and these are
used to build and send an email message. In the filter mode, calibre-smtp reads a complete email message from STDIN and sends it.
text is the body of the email message. If text is not specified, a complete email message is read from STDIN. from is the email address
of the sender and to is the email address of the recipient. When a complete email is read from STDIN, from and to are only used in the SMTP
negotiation, the message headers are not modified.
Whenever you pass arguments to calibre-smtp that have spaces in them, enclose the arguments in quotation marks.
OPTIONS
--version
show program's version number and exit
-h, --help
show this help message and exit
-l, --localhost
Host name of localhost. Used when connecting to SMTP server.
-o, --outbox
Path to maildir folder to store failed email messages in.
-f, --fork
Fork and deliver message in background. If you use this option, you should also use --outbox to handle delivery failures.
-t, --timeout
Timeout for connection
-v, --verbose
Be more verbose
COMPOSE MAIL
Options to compose an email. Ignored if text is not specified
-a, --attachment
File to attach to the email
-s, --subject
Subject of the email
SMTP RELAY
Options to use an SMTP relay server to send mail. calibre will try to send the email directly unless --relay is specified.
-r, --relay
An SMTP relay server to use to send mail.
--port Port to connect to on relay server. Default is to use 465 if encryption method is SSL and 25 otherwise.
-u, --username
Username for relay
-p, --password
Password for relay
-e, --encryption-method
Encryption method to use when connecting to relay. Choices are TLS and SSL. Default is TLS.
SEE ALSO
The User Manual is available at http://calibre-ebook.com/user_manual
Created by Kovid Goyal <kovid@kovidgoyal.net>
calibre-smtp (calibre 0.6.53) July 2010 CALIBRE-SMTP(1)