Sometimes, while sending emails using your email provider's SMTP server, you might receive error messages as below. 

Your SMTP email provider would have rejected your mail for a few reasons.  

Why did your email get rejected?

• You might have reached your email provider's sending limit for the day.
• Your mailbox is temporarily not reachable.
• Your email account is disconnected from Freshsales.
• The text or links in your email message is suspicious.
• A large number of recipients were added to Cc or Bcc.

What can be done to fix this?

• Retry sending your email after 24 hours post rejection. To Know your daily sending limits click here
• When your mailbox is not reachable, Freshsales re-tries to connect your email provider every 5 minutes.
  You can retry sending emails after 10 minutes.
• Your mailbox can be disconnected due to invalid credentials, you must have updated your account's password, reconnect your email account with Freshsales. 
• Remove every link asking for personal details.
• While sending bulk mails, choose Freshsales SMTP under "Connect your email" option.