I can flip-flop between two errors but not avoid both:

1 - if using SMTP I can get the "contact us" page working fine, but there's errors in the ordering process in that relaying emails is refused "554 5.7.1 : Relay access denied". Customers don't know if their orders were successful and so forth. The log file says :

[05-Mar-2014 13:43:57] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/***/***/includes/classes/class.smtp.php:1049) in /home/***/***/*alternative admin name*/includes/functions/general.php on line 21

2 - switching to SMTPauth the "contact us" page fails - "Email Error: SMTP Error: The following recipients failed: [email protected]" which is the store-owners email address. However, ordering is absolutely fine. No log error generated. Email archive shows the email was sent. Can send email from admin>tools>send email but returns a page of SMTP dialogue.

I've tried the "email_test_tool.php" and this is happy with SMTPauth but "relay denied" on SMTP.

The host is domainmonster.

Site is www.allwarm.co.uk

zc version is 1.5.1 - no upgrades

Template is Anne's Picaflor Azul: Stirling Grand

Thanks