"SMTP mail server for Webmail", by Cliff H.

Question "SMTP mail server for Webmail", by Cliff H.
Answer, by Hugo V.
Answer, by Leland V. (Gandi)

in webmail You don't need to have a SMTP server since you're using a browser … There is no option in any webmail to fill in either a pop or smtp server …

Question "SMTP mail server for Webmail", by Cliff H.

I am looking to set the correct SPF record in my DNS, so my outgoing mail is not delayed or categorised as spam. for those not familiar with SPF, see details here http://www.openspf.org/

For my desktop client mail (Outlook) I use the SMTP servers of my ISP which have been added to the SPF record.

My enquiry is related to which SMTP servers are used for Webmail.

Is relay.mail.gandi.net the correct and only one?

PS I think I found the answer myself by checking the gandi.net DNS zone. The IP range ip4:217.70.176.0/21 seems to be the answer which I was looking for.