Someone had the same problem here:
2 more questions:
Maximum allowed email + subject + message length is 120 symbols.
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Is that still correct? That would be way to few to send error mail containing actual sensor data at error time for me. I read about #define BLYNK_MAX_SENDBYTES but what is the maximum number of bytes I am able to put there?
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What’s the maximum delay needed between mails? And is there some blocking time once flooding? I will only send one mail in case of error but since I stumbled over it while testing it would be nice to know.