Failed to send email

[Niffy]

Hello,
when I try to send an email through the form on my website (on the Chopin server) using Tectite Formmail, it gives the following message "Failed to send email". The email funtion worked properly until little ago and no files or configurations have been modified.
Thanks

---------- Post added at 01:26 PM ---------- Previous post was at 03:44 AM ----------

I have also had a look at various forum threads and it does not appear to be a solution previously posted. The tectite FromMail.php is configured for using as sender (or more probably "reply to", I am not sure) address the one specified by the user who sends the email thorugh my website.
In any case, the script worked perfectly until at least August 1st.
Is there any admin who can tell me if the problem is related to the Chopin server, or if I have to change the cript configuration?
Email sending is essential for my website and I have lost a lot of emails.
Thanks for your support

UPDATE: I filled in the form on my website with an email account registered in my cpanel, but it failed to send email as well.

[Niffy]

Update: when sending email the server now gives this error message:
Deprecated: Function set_magic_quotes_runtime() is deprecated in /home/[mysite]/public_html/sendmail.php on line 167

The sendmail php script content is the following (lines on the left):
162 //
163 // Capture the current date and time, for various purposes.
164 //
165 $lNow = time();
166
167 set_magic_quotes_runtime(0); // disable this silly setting (usually not enabled)
168 ini_set('track_errors',1); // enable $php_errormsg

I disabled the line 167 with // but the form still displays (without other messages) failed to send email.

[Niffy]

The server problems now appears to be solved, Thank you