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Marcel van NoortMarcel van Noort 

i send a email from salesforce and the person replied to me, but I don't show up in salesforce by the lead. Is that possible and how can I do that? \

NagendraNagendra (Salesforce Developers) 
Hi Noort,

Yes, It will not Show Up.Its Standard Functionality.

WorkAround:
Yes, this can be achieved Via Programming and Create Custom Lookup field in Email Message to Lead.
The Reply Email which is sent from Gmail can be stored in Particular Lead under Email Message Related List.

For Follow Up:
  • https://salesforce.stackexchange.com/questions/203820/send-and-receive-email-in-account-lead-opportunity-quotes-contact-and-maintain-e/204199#204199
You cannot use the Standard Email Functionality, Which is standard Email Quick Action.

Because we cannot attach the setReplyTo (Which is Email service address used to get the Reply information back to Salesforce) while sending Email from salesforce to Gmail.

We have to create Custom Quick action, Custom Page, Apex Class, Email Service Address, Custom Lookup field from Email Message to Lead.

Thanks,
Nagendra