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Sakthi RSakthi R 

Email Limits Confusion

Could any body cleary explain why there is two email classes 1.Single email 2.Mass Email??
what is the use of Mass Email when we can sent our emails through single email class itself??

What is the exact limit of sending email??
for each execution
how many emails can we send in every org??
for how many users we can send in a single email??
Jairaj SinghJairaj Singh
Mass email is used, In layman terms,when you have to communicate same message to multiple person. Technically, your email server is just sending one email - with mass email class so if you  have 100 Account, Contacts, Leads objects you can set the list of those object ids and send in once - Just one MassEmailMessage.   
In case of Single Email class, you will have 100 SingleEmailMessage. 

Limits also depends on your version. please see details at below link. 
https://developer.salesforce.com/docs/atlas.en-us.salesforce_app_limits_cheatsheet.meta/salesforce_app_limits_cheatsheet/salesforce_app_limits_platform_email.htm