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Full Discussion: External SMTP server
Operating Systems Linux Red Hat External SMTP server Post 302937234 by Neo on Wednesday 4th of March 2015 09:49:08 AM
Old 03-04-2015
It's normal to have the A records of MX records public.

There is an old saying "Security by Obscurity is NOT Security"

So, your goal would be to correctly secure the MX server, not hide it somehow.
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PIUS(1) 						      General Commands Manual							   PIUS(1)

NAME
pius - PGP Individual UID Signer SYNOPSIS
pius [options] -s <signer-keyid> <keyid> [<keyid> ...] pius [options] -A -r <keyring-path> -s <signer-keyid> DESCRIPTION
pius The PGP Individual UID Signer (PIUS) is a tool for individually signing all of the UIDs on a set of keys and encrypt-emailing each one to it's respective email address. This drastically reduces the time and errors involved in signing keys after a keysigning party. OPTIONS
--version show program's version number and exit -h or --help show this help message and exit -a or --use-agent Use pgp-agent instead of letting gpg prompt the user or every UID. [default: false] -A or --all-keys Sign all keys on the keyring. Requires -r. -b PATH or --gpg-path=PATH Path to gpg binary. [default: /usr/bin/gpg] -e or --encrypt-outfiles Encrypt output files with respective keys. -d or --debug Enable debugging output. -H HOSTNAME or --mail-host Hostname of SMTP server. [default: localhost] -i or --interactive Use the pexpect module for signing and drop to the gpg shell for entering the passphrase. [default: false] -I or --import Also import the unsigned keys from the keyring into the default keyring. Ignored if -r is not specified, or if it's the same as the default keyring. -m EMAIL or --mail Email the encrypted, signed keys to the respective email addresses. EMAIL is the address to send from. See also -H and -p. -M FILE or --mail-text Use the text in FILE as the body of email when sending out emails instead of the default text. To see the default text use --print- default-email. Requires -m. -n EMAIL or --override-email Rather than send to the user, send to this address. Mostly useful for debugging. -o OUTDIR or --out-dir Directory to put signed keys in. [default: /tmp/pius_out] -O or --no-pgp-mime Do not use PGP/Mime when sending email. -p or --cache-passphrase Cache private key passphrase in memory and provide it to gpg instead of letting gpg prompt the user for every UID. [default: true] -P PORT or --mail-port Port of SMTP server. [default: 25] -r KEYRING or --keyring The keyring to use. Be sure to specify full or relative path. Just a filename will cause GPG to assume relative to ~/.gnupg. [default: ~/.gnupg/pubring.gpg] -s SIGNER or --signer The keyid to sign with (required). -S or --mail-tls Use STARTTLS when talking to the SMTP server. -t TMP_DIR or --tmp-dir Directory to put temporary stuff in. [default: /tmp/pius_tmp] -T or --print-default-email Print the default email. -u USER or --mail-user Authenticate to the SMTP server, and use username USER. You will be prompted for the password. Implies -S. -v or --verbose Be more verbose. AUTHOR
PIUS was written by Phil Dibowitz <phil@ipom.com> This manual page was written by Luke Cycon <lcycon@gmail.com>, for the Debian project (but may be used by others). MARCH 2010 PIUS(1)
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