How to whitelist Area101 mail servers.

The primary blocker of email is spam filtering. We use SPF records on to indicate what email servers on the internet can send mail on our behalf. They look like this:

$ dig -t txt 3600 IN TXT "v=spf1 mx ?all"

The above records tell any email servers who receive an email from that the email servers at (as defined by and (as defined by are the only permitted senders, and that any other source of email is dubious and should be blocked. The alternative is to specifically whitelist our sending ip (currently at

We define permitted senders of emails as 3 ranges of IPs where our servers reside, where we also send FoodVenue emails on behalf of other domains.
 $ dig -t txt 3600 IN TXT "v=spf1 a ptr ip4: ip4: ip4: ~all"

So, to ensure proper delivery of our FoodVenue emails, our SPF record should be included as "" per the first example above, for each domain. Alternatively, they may whitelist our mail server IP from, or whitelist all 3 IP ranges in the second example above.

Short summary for IT folks:

Add to your SPF record or whitelist If you whitelist, consider whitelisting all 3 ip ranges above.

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