Expat - Mail tax documents after June 15?

[tomgusa2]

I am an expat and deadline is June 15, (2 days from now), should i file an extension? Because if i mail it to IRS, it will not reach IRS before june 15.

[DoninGA]

For a mailed tax return, the IRS uses the postmark date on the envelope to determine if the tax return was timely filed.