Mail warning: “This mail is probably not sent from

-- url of the page with the problem -- : voetbalgek.info/
-- HikaShop version -- : 2.3.4. starter
-- Joomla version -- : 3.3.6
-- PHP version -- : 5.3.29
-- Browser(s) name and version -- : multiple
-- Error-message(debug-mod must be tuned on) -- : “This mail is probably not sent from” …
Notice: Undefined index 196 in /mnt/webr/c1/24/54385524/htdocs/media/com_hikashop/mail/order_status_notification.preload.php on line 116

Customers receive this warning when they receive order status mail:

“This mail is probably not sent from” …
Notice: Undefined index 196 in /mnt/webr/c1/24/54385524/htdocs/media/com_hikashop/mail/order_status_notification.preload.php on line 116

Any idea what to do with this?

Well, the message is true. In fact, even if the "probably" were removed, it would be true, since the mail had not been sent from ...@gmail.com, indeed.

It looks like in the HikaShop configuration you've set that Gmail address as "From" address. However, the system is not using a Gmail outgoing mail server, but your domain's mail server named "whatever.voetbalgek.info".
This discrepancy can lead to all sorts of problems. On the recipient's side, it's unpredictable for you as it depends on what's in use there:

• Some incoming mail servers or email clients may be fine with it.
• Some may classify it as spam.
• Some may be generally fine, but display a warning like the one you're seeing here.

Additionally, one day your web hosting provider might disallow this (like many others already do), which would then result in such mails not even being sent anymore.

The only way to safely avoid any of this is to use a valid, regular address under your domain as "From" address, e.g. This email address is being protected from spambots. You need JavaScript enabled to view it.. (Same for the "Bounce Address" - best read the documentation on email settings .)

Good news: If you prefer a customer's reply to your mails going to your Gmail account, it's okay to use that address in the "Reply-to" field.

nicolas wrote: Regarding the Notice message, you can easily remove it by turning off the "error reporting" option of the Joomla configuration.

From what MGFM said ("Customers receive this warning"), it's what the recipient of the email got, not MGFM himself, so turning off any reporting won't help in this case, even though the hint for turning off error reporting isn't wrong in general.
Anyway, that's why I tried to explain the whole story.