IRIS portal communication by mail or on the portal?

Will all IRIS Managers/Contributors added in the case/procedure receive the IRIS notification email or should they have to check from time to time their log page on IRIS portal?
Will Scientific contact service will received any mail from IRIS in the future if a need is encontered in the future or should the Scientific contact service have to connect from time to time on IRIS portal? 

Automated emails from the IRIS system are sent only to the "Portal contact" (a.k.a. "Submission contact") of the submission.

For emails sent manually, the EMA staff member will also normally include only the "Portal contact" as the addressee. If an email sent to the IRIS system contains other addressees, and the EMA staff person replying uses reply-to-all, then other addressees may also receive the reply; however it is to be noted that the IRIS interface used at EMA rejects email addresses that are not registered as users/contacts in the system. 

By default, the Portal contact is the person who has created the submission in IRIS, however this role can be reassigned in the Industry portal by any Industry Manager associated to the submission (or by the Industry IRIS coordinator for all submissions), to any other Industry Manager associated to the same submission. This can be done any number of times. More details can be found in section 2.4 of the IRIS guide for applicants, available in the IRIS Portal.

Portal contacts are encouraged to change the portal contact as appropriate, for example before a period of absence or when leaving the company, and to set up auto-forward rules in their own email server, if desired.