sendmail on OpenShift / PHP / CodeIgniter -

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i'm looking openshift configuration information sendmail functionality.

it's not totally clear me preferred way of doing is.

some articles 1 must have pear/mail.php modules installed, others when using relay. others openshift supports outgoing mail default, although issues.

then i've looked cartridges may available, if approach, no luck there, although there sendgrid quickstart.

all i'm trying really, send couple of emails application. no large quantities, or mass marketing mailings.

can please give me short , sweet how-to?

thanks in advance.

openshift online hosted on amazon's ec2 service. email servers configured detect , blacklist emails originating ec2 when detects spam. although may work initially, there chance emails start silently fail after time due being blacklisted.

it recommended relay through 3rd party smtp server/service:
https://www.openshift.com/blogs/email-in-the-cloud-with-mailgun
https://www.openshift.com/blogs/enabling-transactional-email-on-paas-with-sendgrid


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