t0:
driver = appendfile
file = DIR/test-mail/$local_part
+ create_file = DIR/test-mail
user = CALLER
t1:
driver = smtp
hosts = 127.0.0.1
port = PORT_S
+ hosts_try_fastopen = :
max_rcpt = 1
allow_localhost
return_path = pqr=$local_part+$domain@verp.domain