[Macca]

I have many scripts across my domains that successfully send email via PHP. Usually these emails are delivered to an email address within a domain hosted on an EUK server.

However one customer of mine has emails sent to his BTinternet email address and this sometimes takes up to 10 hours to deliver.

I also have sent test messages to an email account I have through 1&1 and these don't even get delivered.

I have checked and these addresses do not have any filters running on them and the messages aren't being placed in a junk folder.

Does anyone know a way of ensuring PHP mail gets delivered to all email accounts?

Thanks.