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The heap size of Email service is 36MB as given here (https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_gov_limits.htm).
So if you are just sending an email that will only contain text body then it can contain 36,000,000 characters. But you might run into SMTP server limts which varies from email client to email client.
As per this article this (http://kb.mailchimp.com/delivery/deliverability-research/gmail-is-clipping-my-email) article Gmail clips the body if it is greater than 102KB.
Hope this helps,
Sandeep
All Answers
The heap size of Email service is 36MB as given here (https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_gov_limits.htm).
So if you are just sending an email that will only contain text body then it can contain 36,000,000 characters. But you might run into SMTP server limts which varies from email client to email client.
As per this article this (http://kb.mailchimp.com/delivery/deliverability-research/gmail-is-clipping-my-email) article Gmail clips the body if it is greater than 102KB.
Hope this helps,
Sandeep