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Since the end of 2022, Google has stepped up its security standards for mail flows, and now requires senders attempting to reach an “@gmail” address to include an SPF entry.
To stop receiving this type of return mail :
You need to create an SPF entry in your DNS zone.
Here’s a generic example of an SPF entry that you can implement on your DNS zone if you encounter this problem while having your mail service hosted at DFI :
v=spf1 include:smtp.dfinet.ch ~all |