Limit for Email Send Per Day
Certainly gmail has certain limits in place. It is likely that users did not notice that email send has daily limit on messages. Some of them here, For instance, the highest size of attachment files which you can include in an email message is 25 MB and the full free storage limit for a Gmail account is 15 GB.
Generally , in a day you can send limited email send through your Gmail account. If you exceed the daily limit, Google can temporarily disable your Gmail account without any notice and you have to wait up to 24 hours before you access to your own Gmail mailbox.
Email Send Limit Messages
Gmail is not designed for sending bulk email. If you are planning to email send to a largest group of friends using Gmail, Must read the following rules to avoid from the temporary lockdown–
Rule 1: You can send emails to a maximum of 500 recipients each day through your Gmail Account. If you trying to exceed limit the Gmail account get must temporarily disabled your gmail account.
Important to note that this limit is around of recipients and not messages. Though you can email send 10 to each 50 people or 1 email can be send to a maximum of 500 people.
Rule 2: If you want to access Gmail via IMAP or POP clients, like Apple Mail or Microsoft Outlook, you can email send to a maximum of 100 people at a time. If you exceed the limit, your account would be disabled for a day with the error messages 550 5.4.5 Daily sending quota exceeded.
Rule 3: Check email addresses of recipients before email send. Because your account would be disabled if the email message contains a large number of non-existent or broken addresses.
Rule 4: Using your Gmail account you can associate various email addresses and email send on any other address. When sending mail from a different address, the genuine account message limits are applied.
Rule 5: When you are sending emails through Google Script, such in the case of Gmail Mail Merge, the daily sending limit is 100 recipients each day for free Gmail accounts. Here you can use the Mail App. For getting Remaining Daily limit method to know your existing quota else the script will throw an exception saying.
If you upgrade to Google Apps and more email send messages through Google Scripts. Even then, your sending limits must will be increased after a few million cycles or if you have decided 5 or more users.