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Does IP affect mail deliverability?
When sending from a mobile device through a client app like Spark or Canary, does my device's IP address affect mail deliverability?
IMHO, I began to notice this effect.
Someone can explain?
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I don’t know how Spark or Canary work, I never used it, but I used the SMTP protocol.
The IP from which you send mail via SMTP (for example, the gmail application does not use it) will be written in the Received header (there may be several such headers). Spam cutters look at these fields quite well and use the specified addresses for checks. Some mail.ru (not to mention self-made servers) are crazy enough to block emails based on only one IP from the header.
It shouldn't - the mail is delivered by the server, not the mobile application.
Although theoretically, it is possible to pull by the ears that some kind of anti-smm looks at the headers of the letter (the IP from which the message got to the mail server gets there), but this is unlikely.
It looks like you're sending emails via Gmail.
Go to the full version of Gmail, then to the "Sent Items" folder, then to any letter there, click on the three vertical dots in the upper right corner and select the "Show original" line there.
Make sure that the client's IP (either Spark or Canary) is NOT there!
Conclusion:
You are paranoid :) !
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