Revert "Reuse smtp handle and avoid making one per message"
Revert "Reuse smtp handle and avoid making one per message"

This reverts commit d135b38cce0dc65c19f24bb444ecbf53c39cd921.

jrgp/iris-api-opensource,linkedin/iris,dwang159/iris-api,jrgp/iris-api-opensource,jrgp/iris-api-opensource,linkedin/iris,dwang159/iris-api,linkedin/iris,linkedin/iris,jrgp/iris-api-opensource,dwang159/iris-api,dwang159/iris-api