Maximum allowed email + subject + message length is 120 symbols. However you can increase this limit if necessary by adding #define BLYNK_MAX_SENDBYTES XXX to you sketch. Where XXX is desired max length of your email. For example for ESP you can set this to 1200 max length #define BLYNK_MAX_SENDBYTES 1200. The #define BLYNK_MAX_SENDBYTES 1200 must be included before any of the Blynk includes.
Only 1 email per 5 seconds is allowed
In case you are using gmail on the Local Server you are limited with 500 mails per day (by google). Other providers may have similar limitations, so please be careful.
User is limited with 100 messages per day in the Blynk Cloud;
http://docs.blynk.cc/#widgets-notifications-email
Maximum allowed email + subject + message length is 120 symbols. However you can increase this limit if necessary by adding #define BLYNK_MAX_SENDBYTES XXX to you sketch. Where XXX is desired max length of your email. For example for ESP you can set this to 1200 max length #define BLYNK_MAX_SENDBYTES 1200. The #define BLYNK_MAX_SENDBYTES 1200 must be included before any of the Blynk includes. Only 1 email per 5 seconds is allowed In case you are using gmail on the Local Server you are limited with 500 mails per day (by google). Other providers may have similar limitations, so please be careful. User is limited with 100 messages per day in the Blynk Cloud;