> Most ISP's who employ decent spam filtering will reject mails that fail an > SPF or DKIM check.. > This is where a domain has an SPF record but the mail comes form a server > not listed in the SPF record, or has a DKIM record but there was no domain > key.
Well, ok, but honestly how many messages fail a DKIM check? You only use DKIM if you have it set up, and I've never seen a host that will reject unsigned messages. And for SPF, do you treat soft fails the same as hard fails? The vast majority of SPF records specify soft fails rather than hard fails, indicating a lack of certainty from the sender's domain about how to treat SPF failures. > We do this as well, and it rarely causes us any problems and we deal with > hundreds of domains and millions of emails a day. > If a customer reports not receiving email from a specific email address, we > check the logs, if it is an SPF rejection we simply tell them the reason > and they will go back to the sender and tell them to sort out their SPF > record, which is in fact doing the sender a favour as they will have been > getting rejected by many other ISP's as well until someone tells them. I suspect that the position of an ISP may be different from the position of a company that manages its own mail. I've worked with many Google Apps customers, going up to forty thousand seats for a single customer, and it's been very rare that they've been happy using SPF as a strict filter. Many use it as a tagging mechanism for soft fails, though. As for "doing the sender a favor", I agree with you in a technical sense but I haven't found it to be a practical response to an end-user within a large company. Dave Watts, CTO, Fig Leaf Software http://www.figleaf.com/ http://training.figleaf.com/ Fig Leaf Software is a Veteran-Owned Small Business (VOSB) on GSA Schedule, and provides the highest caliber vendor-authorized instruction at our training centers, online, or onsite. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Order the Adobe Coldfusion Anthology now! http://www.amazon.com/Adobe-Coldfusion-Anthology/dp/1430272155/?tag=houseoffusion Archive: http://www.houseoffusion.com/groups/cf-talk/message.cfm/messageid:355338 Subscription: http://www.houseoffusion.com/groups/cf-talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/groups/cf-talk/unsubscribe.cfm
