SPF records for SMTP service

Please help me to create SPF record that will be helpful
to validate my outgoing mail. Here is my server
environment.

We hosted an application at one
hosting provider. Though he provided mail services, we are not using it. Instead we are
using GoogleApps for official mail purpose. For this we already configured SPF record as
"v=spf1 include:_spf.google.com ~all".

Along
with this we have newly configured another SMTP server to use it for sending
newsletters, promotional mails to our website visitors, as there are some limitations in
usage of number of emails per day with
GoogleApps.

We want to have both email services:
GoogleApps and new SMTP server. In such cases, how can we create SPF record mentioning
both IP addresses? Here is my new SMTP server IP:
45.23.77.65

Thanks in
advance,

Max

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