The Web API also allows you to add an extra layer of security to your program by utilizing API keys. The extra back and forth necessary in SMTP relay can cause some (minimal) latency for customers who are outside of the United States, and thus further from our inbound data centers. SMTP relay creates multiple points of potential failure, meaning that there are more places in the conversation between the sender and SendGrid that could cause one of those “not okay” messages. It's recommended to use Sendgrid REST API over SMTP.īecause of the extra “chatter” back and forth during an SMTP connection, we suggest that SendGrid customers use the Web API when possible for several reasons:
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