To avoid getting flagged as spam:
- Avoid all X-Priority headers
- Avoid all X-Mailer headers
- Use an SPF record like youdomain.com. 3600 IN TXT "v=spf1 ip4:123.123.123.123 -all"
- Use DKIM signing
- Ensure mail server’s DNS resolved to the same name for both forward / reverse
- Ensure MX record matches mail server’s resolved DNS name
- Apply for AOL whitelist status http://postmaster.aol.com/
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