many hosts, like yahoo or other mail hosts do not return a 250 code.
yahoo:
Could not verify email address at host yahoo.com: 421 Message from (my ip address) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html
other:
Could not verify email address at host somehost: 421 Too much load; please try again later.
therefore many users cant registrate, as their mail isnt listed as valid. in my opinion, if a host returns 421 the mail should be listed as valid
therefore, please change
(line 115)
if (!ereg ("^250", $from)) {
to
if (!ereg ("^250", $from) && !ereg ("^421", $from)) {
and (line 129)
if (!ereg ("^250", $to )) {
to
if (!ereg ("^250", $to ) && !ereg ("^421", $to )) {
thanks!