I'd love to include Yahoo's IPs in the whitelist via the same methods used for all other mails, but their SPF record doesn't support queries to expose their netblocks. The includedscrape_yahooscript, which creates a static list of Yahoo! IPs by scraping their web page, is an acceptable...
SPF is a DNS TXT entry that enables the receiving mail server to check that an email claiming to come from a certain domain is connected to an authorized IP address. The receiving server does this by looking up rules for the bounce or return-path domain in the DNS record. That is compar...
Finally, security vendors have improved their products and consulting services to make deployment easier. Valimail, Barracuda and Agari are just three of many such vendors, andProofpoint has a free interactive tool to create your DMARC record here. (Note: I tested Valimail on my own email infrast...
Received-SPF: TempError (protection.outlook.com: error in processing during lookup of "domain-name": I have encountered an issue I believe is extremely widespread (albeit intermittent) affecting deliverability to hotmail.com / outlook.com from .AU Domains. During the past few days, I ...