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基本上你會需要加一行 如下方的 SPF Record 到你的 Cpanel 裡面 (domain 名字得改成你的)
v=spf1 a mx include:spf.mtasv.net include:_spf.createsend.com ~all.
可以看看這個文章 講解 SPF 是怎麼運作的。
https://postmarkapp.com/guides/spf#what-is-an-spf-record
How do I implement an SPF record on my domain?#
You do not need to do anything to pass SPF on emails sent through Postmark, but for most services, implementing SPF only requires a TXT entry in DNS. That entry consolidates multiple values in a short line of text. If a provider needs you to add them to your SPF entry, they’ll provide the full text that you need to copy into your SPF entry. However, as you accumulate providers and need to add more, it’s important to know that you only need to take the include: portion from their instructions and insert that into your existing SPF entry.
The most common mistake when setting up SPF is having multiple SPF TXT entries in your DNS. If you do, the receiving server won’t know which SPF TXT entry is the definitive entry. This can result in valid servers failing SPF. So whenever you need to add an SPF record for a new service, always make sure that you don’t have an existing SPF TXT entry first. If you already have an entry, just add the service to that entry.
How does the SPF record syntax work?#
SPF record syntax might look complicated and confusing at first, but it is fairly easy to understand once you know the basics. Let’s look at a breakdown of the key elements (also called “mechanisms”) in an example SPF record entry of v=spf1 a mx include:spf.mtasv.net include:_spf.createsend.com ~all.
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