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In case someone else is looking… I found the answer here:
http://wiki.botonakis.com/%CF%84%CF%81%CE%AC%CF%80%CE%B5%CE%B6%CE%B1-%CF%80%CE%B5%CE%B9%CF%81%CE%B1%CE%B9%CF%8E%CF%82-test-%CE%B3%CE%B9%CE%B1-live-%CE%BB%CE%BF%CE%B3%CE%B1%CF%81%CE%B9%CE%B1%CF%83%CE%BC%CF%8C/

Basically, you are simply put the test account details provided from the bank to the plugin and do 8 transactions (i.e. buying from the eshop products more than 10euros) and as credit cards details etc… you use the info given in the test cases. Documentation here: https://paycenter.piraeusbank.gr/redirection/content/Manuals/Redirection.zip

Regards

Same here.
Some guidance would be much appreciated.

Many thanks

Same issue here.
In my case it looks like a conflict with Yoast SEO plugin. Both work in isolation but not together. 🙁

That would really be useful.
I couldn’t find a way. It seems to do it Lists & “Service” options.

Many thanks for your help!

The setup seemed to be correct but Gmail probably did not like access to the account from different distant locations. I could see that me checking the mails from UK and the SMTP authenticating from Germany was considering as suspicious activity in Gmail logs.

I now have one account to do the authentication through the SMTP plugin and another where the form is been send.

Works fine now.

Thanks for your prompt reply expharm.

I installed it & configure it with SSL & authentication and it worked.

But then problems 🙁 I am using a simple gmail account (small customer and I didn’t need to set up a Google apps account).
Gmail got all funny, and start suspending the account every couple of incoming forms, asking me to provide new pass every time.

Now I am lost somewhere between gmail’s 2-step verification and “application specific passwords”, so the battle is far from over.

I think my problem is that I access the account from a different country from the WP-Mail-SMTP authentication (as server is located abroad) and this looks suspicious.

Yet, this “contact form not sending problem” is affecting more than 5 of my sites with different hosting providers, WP versions and form plug-ins, so my best guess is that email providers (gmail, yahoo…) probably implemented some new rules on the incoming emails in order to fight spam. Could this be an explanation?