(See new info at end!) Hey, big senders! It's time for another update regarding enhanced sender requirements put forth by a large mailbox provider.
This time around, it is French mailbox provider La Poste (laposte.net), and they are adopting authentication-related sender requirements similar to those that you're likely already aware of, courtesy of so many other large providers.
Some details are still TBD, but Simon Bressier from La Poste has been kind enough to warn us that starting in September 2025, email messages that do not pass SPF, DKIM and DMARC checks will see the inside of the spam folder "at best," implying that other, additional sanctions could befall non-compliant senders.
If you don't like seeing your mail getting relegated to the spam folder, my recommendation is to make sure that all of your emails pass both SPF and DKIM authentication checks, and that at least one of them "aligns" with the from address, so you'll pass DMARC checks, too.
September 4, 2025 Update: Simon provided this additional information to share with you here.
Starting on Tuesday, September 9th at 9am (French time), laposte.net will enforce penalties for emails without any valid authentication (SPF, DKIM, or DMARC). Consequence: such emails will end up in the spambox at best, or be rejected.
Technical points:
SPF and DKIM are also considered “none” if not aligned with the From (RFC5322.From).
SPF: if the MailFrom (RFC5321) is not aligned with the Header From → SPF = none.
DKIM: if the signed domain is not aligned with the Header From → DKIM = none.
For routers using shared domains (MailFrom and/or DKIM), this will be treated as non-aligned, thus “none”.
If multiple DKIM signatures exist, only one needs to be aligned.
Simon further clarified that SPF/DKIM alignment can be either/or: it's OK if only one aligns, and not both. For example, DKIM aligns, but SPF does not -- this is a common configuration with email senders using various ESP platforms, such as Mailchimp. You'll still want to ensure that both DKIM and SPF pass, even if one of them does not align.
(See new info at end!) Hey, big senders! It's time for another update regarding enhanced sender requirements put forth by a large mailbox provider.
This time around, it is French mailbox provider La Poste (laposte.net), and they are adopting authentication-related sender requirements similar to those that you're likely already aware of, courtesy of so many other large providers.
Some details are still TBD, but Simon Bressier from La Poste has been kind enough to warn us that starting in September 2025, email messages that do not pass SPF, DKIM and DMARC checks will see the inside of the spam folder "at best," implying that other, additional sanctions could befall non-compliant senders.
La Poste does have a Postmaster page, and information will be updated there shortly, if not already.
If you don't like seeing your mail getting relegated to the spam folder, my recommendation is to make sure that all of your emails pass both SPF and DKIM authentication checks, and that at least one of them "aligns" with the from address, so you'll pass DMARC checks, too.
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