We have recently had our website rebuilt., The Website developers recommended WordPress, which is what we went with.
When someone fills out a contact form or forgets their password the site would send us or the user an email. This worked for the first month or so but recently some users have complained their emails are not arriving for lost passwords resets, and we are not receiving notifications from the site anymore.
The hosting company assures us that the emails are being generated and leaving the site, so the website developers say it is not their issue, as far as they are concerned things are working and emails are being generated.
The hosting company recommend sending email via SMTP instead of directly from the site. What would be the best method/service to accomplish this?
The SMTP service would need to be secure so that would need to be a consideration.