To keep our systems healthy and combat spam, email providers limit the amount of mails each user can send. These limits restrict the number of messages sent per day and the number of recipients per message. So you'll encounter an error when you send emails from Freshsales using your email provider's SMTP server.
For ex, say the max limit for the number of mails is 1000 per day and you attempt sending more, an error message pops up.
Sending limits can change without notice. Limits per day are applied over a 24-hour period, not any specific time of the day.
Each provider has a different limitation. You can find the limits for the most used email providers below:
After reaching one of the below limits, a user can't send new messages for up to 24 hours. However, they can still receive incoming email. After this suspension period, sending limits are automatically reset and the user can resume sending mail.
These are the major limitations set by Gmail:
Messages per day
daily sending limit*
2000 (500 for trial accounts)
Unique recipients per day
Individual addresses count once a day; 5 emails sent to 10 addresses
count as 10 unique recipients*
3000 (2000 external, 500 external for trial accounts)
Recipients per message sent via SMTP
Addresses in the To, Cc, and Bcc fields of a single email*
For more details refer Gmail sending limits in G suite
Message rate limits determine how many messages a user can send from their Office365 account within a specified period of time. This limit helps prevent overconsumption of system resources by a single sender.
These are the major limitations set by Office 365:
Incoming & Outgoing message rate
30 messages per minute, 10,000 messages per day
500 per message
125 attachments per message (max size per file: 25 MB)
25 MB per message including message header, body and attachments
For more details refer Office365 sending limits
Refer respective support articles to know the daily limits for other email providers.
Recommendations for sending bulk emails
To avoid exceeding limits while sending bulk mails, like in case of email campaigns, send to one group of recipients, wait for 24 hours and then target another group.