webCRM's IP addresses must be whitelisted if you use Custom SMTP to send out emails. Below you can find these IP addresses.
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Present:
20.73.112.243, 20.73.114.237, 20.73.115.25, 20.73.115.209, 20.73.115.225, 20.73.116.17, 20.50.2.53
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Additional Outbound IP Addresses:
20.73.233.136, 20.73.112.88, 20.73.112.66, 20.73.112.129, 20.73.113.91, 20.73.113.149, 20.73.113.151, 20.73.113.247, 20.71.78.234, 20.73.236.35, 20.73.112.38, 20.73.112.126 112.243, 20.73.114.237, 20.73.115.25, 20.73.115.209, 20.73.115.225, 20.73.116.17, 20.73.112.163, 20.73.236.12, 20.73.116.20, 20.73.237.182, 20.73.112.61, 20.73.112.210, 20.73.238. 20.73.116.25, 20.73.117.125, 20.73.117.127, 20.73.117.144, 20.73.117.235, 20.50.2.53