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Thread: Multiple DKIM and SPF record
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10-18-2017, 01:01 PM #1Junior Guru
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Multiple DKIM and SPF record
Hi All
Is it ok to have multiple SPF and DKIM records for a single domain? Can it create any issues for SEO, or IP blacklisting or making transactional mail as span.
Thanks
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10-18-2017, 01:04 PM #2Web Hosting Master
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The best thing you can do is make sure the information in the records are correct. Such as your current host's IP or if you're using SendGrid. There shouldn't be "old" or "bad" entries in the records. But yes, you can have multiple and I don't believe it "hurts" your standing.
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10-18-2017, 01:05 PM #3Junior Guru Wannabe
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Hello, Multiple DKIMs will not cause a problem, however, I would advise against using multiple SPF as it can cause email blacklisting. Please take a look here: https://tools.ietf.org/html/rfc4408#section-3.1.2
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10-18-2017, 01:22 PM #4Junior Guru
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10-18-2017, 04:29 PM #5Web Hosting Master
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A single spf record can contain a lot of information, multiple includes even. You shouldn't have any issues with just one.
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10-18-2017, 04:50 PM #6Junior Guru Wannabe
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10-21-2017, 06:34 PM #7Problem Solver
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Multiple strings in one DNS entry will not cause problems, multiple DNS entries will cause problems.
However there is a limitation on how many characters.. rule of thumb is if there is under 450 characters it should fit in 1 packet. Some poorly designed clients will deny spf policies that do not fit in 1 packet. However other TXT entries can also affect this limit.
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11-01-2017, 05:32 PM #8Junior Guru Wannabe
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Your advice is correct but the current SPF RFC https://tools.ietf.org/html/rfc7208#section-3.2 says that "a domain name MUST NOT have multiple records.."
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11-01-2017, 05:47 PM #9Junior Guru Wannabe
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Another gotcha is the 10 DNS-lookup limit. If you're on G Suite, for example, they tell you to add
Code:include:_spf.google.com
A lot of SPF record check tools only verify your syntax and don't evaluate the number of DNS terms. Be sure to use one of the tools that includes your DNS lookup count.
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