Which OTP Code Should I Use?
Why the newest code from the expected sender is usually the right one after repeated verification requests.
Which code should you use?
If you requested several OTPs, the newest code from the sender you expected is usually the one to try first because many services invalidate older codes after a resend.
A resend can change which code is valid
Some services allow several codes to remain valid briefly, while others cancel the previous code as soon as a new one is generated. MailOnce cannot change that sender-side rule.
That is why arrival order and timestamp matter when the inbox contains repeated verification emails.
Do not confuse multiple senders
A temporary inbox can receive more than one verification flow. Match the code to the service you are actually using, not simply to the newest number visible anywhere in the inbox.
Avoid resend loops
Repeatedly pressing resend can create several similar messages and may trigger rate limits. Give the sender a short moment, then request one controlled resend if needed.
The practical takeaway
Newest + expected sender + expected action is the safest practical rule when several OTP messages are present.
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