[Plugin: MailPress] Cannot configure mailing

Andre, let me renew the problem of configuring mailing. I think many people meet the same.

The are three ways to configure mailing, no one works:

1. default SMTP configuration doesn’t save configuration
=> “proc_open” php function is not available, you need to activate Connection_php_mail add-on.

2. php_mail:
=> FAILED. Check your logs & settings !

Log:
MAILPRESS [NOTICE] – Disconnecting from db_sdgi1 (MP_Mail)
MAILPRESS [NOTICE] – Disconnected (MP_Mail)
MAILPRESS [NOTICE] – Connecting to db_sdgi1 (MP_Mail send)
MAILPRESS [NOTICE] – Connected (MP_Mail send)
MAILPRESS [ERROR] – *** Mail could not be sent ***

3. Sendmail:
=> “proc_open” php function is not available, you need to activate Connection_php_mail add-on.

I cannot change hosting it is a charity project.
I cannot change php.ini, proc_open is closed for safety reasons.
At the same time my Workpress sends registration confirmation e-mails successfully.
Doesn’t it mean that mailpress should use the same way as Workpress does?
If not what else can I do?

http://wordpress.org/extend/plugins/mailpress/