<?php

$s = <<<INPUT
Foreigners is still taking the decision on Your case. Thus today 04.10.2018, we 
sent a written request about the phase; for sacri.subba@yahoo.com;
text text text ... for today you; other e-mail test@mai.com
for  another###test@mai.com
INPUT;
if (preg_match_all('~\bfor\s+\K\S+@\S+\.\S+\b~u', $s, $matches)) {
	print_r($matches[0]);
}