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I have 8 IPs in different ranges to add to my SPF records. All are subdomains

mta1.domain.com
mta2.domain.com

and so on.

I can't add each IPv4 to domain.com txt due to limitations. How else can I add all these IPs?

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    What limitations do you refer to?
    – Chris Davies
    Jul 11, 2015 at 4:20

2 Answers 2

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I presume you are referring to the limit of TXT records only being able to hold strings up to 255 characters? Luckily you can chain multiple strings together, which each individual string can contain up to 255 characters.

example.net.    IN    TXT    "v=spf1 some.ip.addresses" "more.ip.addresses" "even.more.addresses ?all"

See also https://kb.isc.org/article/AA-00356/0/Can-I-have-a-TXT-or-SPF-record-longer-than-255-characters.html

This is also what you end up having to do with 2048 bit DKIM keys.

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  • If I enter too many IPs then mail-tester.com shows "Junk encountered in record"
    – demo9928881
    Jul 11, 2015 at 14:12
  • Any chance that you ended up creating a broken record? I just created a txt record for the domain shv25.se, containing 16 ipv4 adresses and 4 ipv6 adresses, without mail-tester.com having any problem with it.
    – andol
    Jul 11, 2015 at 14:44
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Either
1. Get a better DNS hosting provider.
2. Set an A record to cover all your senders which includes all your senders ip addresses.
3. Abuse _include:$myothertxtrecord.example.com.

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