The number of DNS lookups for SPF records is limited to 10 [1] so that that could be a technical issue that needs to be worked around [2] depending on how many

The number of DNS lookups for SPF records is limited to 10 [1] so that that could be a technical issue that needs to be worked around [2] depending on how many SPF records each service adds: [1] http://www.openspf.org/FAQ/Common_mistakes http://www.openspf.org/FAQ/Common_mistakes [2] http://stackoverflow.com/questions/14261214/too-many-dns-lookups-in-an-spf-record http://stackoverflow.com/questions/14261214/too-many-dns-loo...