View Source: SMTPNotes - Waikato Linux Users Group

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Place for notes about [SMTP]

!!! Characters in the local part of the address.

RFC:2821 and RFC:2822 state clearly that only 7bit ASCII characters are allowed in Internet mail addresses.

For a full list of what can/can't and shouldn't be used read this page http://www.remote.org/jochen/mail/info/chars.html

!!! [Virus] and [Spam] filtering

Make sure you've read http://kmself.home.netcom.com/Rants/avspam.html

!!! SMTP Auth

Unless you can do challenge/response authentication, you should make sure your [SMTP] server supports [SSL] as outlined above.  The easiest authentication to get working with [SMTP] is <tt>PLAIN</tt> or <tt>LOGIN</tt> authentication.

See EximSmtpAuth for information about configuring [Exim] for it.

!!! [STARTTLS]

Make sure that your smtp server supports [SSL] (even if you don't have a certificate), it should do [STARTTLS] to [SMTP] servers that support it.

If you use [Exim] with [Debian] stable, install the <tt>exim-tls</tt> package.  For [Debian] testing/unstable (see FlavoursOfDebian), [Exim] already supports [TLS] by default.

If you have an [SSL] certificate, then make sure that [Exim] knows about it (and that your <tt>MX</tt>es match the name on the certificate!) so that incoming connections can be [SSL] encrypted if necessary.

If you relay for other machines, you should set up SSMTP ([SMTP] over [SSL]) on [Port] 465/[TCP].  This is important in particular for laptops which may be used at a hotel, cybercafe or over wireless where port 25 outgoing may be blocked. [MUA]s should be configured to use SSMTP where possible.

Part of CategoryNotes

One page links to SMTPNotes:

SMTPBestPractices

Last edited on Wednesday, December 15, 2004 4:04:16 pm by AdrianKitto

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