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mail_servers [2014/10/10 12:45] 127.0.0.1 external edit |
mail_servers [2018/10/18 02:17] steve |
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| ====== Mail Servers ====== | ====== Mail Servers ====== | ||
| - | * [[Hosting]] | ||
| * [[SendGrid]] | * [[SendGrid]] | ||
| * [[mailx]] | * [[mailx]] | ||
| Line 22: | Line 21: | ||
| SPF records are DNS ''TXT'' records that verify that the server that is sending outgoing email from your domain name is authorized. | SPF records are DNS ''TXT'' records that verify that the server that is sending outgoing email from your domain name is authorized. | ||
| - | As an example, here is the ''@'' ''TXT'' entry for Digital Trike that allows A2 Hosting (75.98.175.91) and GMail (_spf.google.com): | + | Here's a basic example where any email sent out from the domain's A record is authorized. Otherwise, do a hard fail. |
| + | |||
| + | Using as an example, ''beandog.org'': | ||
| + | |||
| + | <code> | ||
| + | v=spf1 a -all | ||
| + | </code> | ||
| + | |||
| + | Authorize only servers that have MX entries in DNS (such as mail.beandog.org), or in other words, for mail servers that receive incoming mail for that domain: | ||
| + | |||
| + | <code> | ||
| + | v=spf1 mx -all | ||
| + | </code> | ||
| + | |||
| + | Find the current MX servers using dig: | ||
| <code> | <code> | ||
| - | v=spf1 a mx ip4:75.98.175.91 include:_spf.google.com ~all | + | dig +short mx beandog.org |
| + | 0 mail.beandog.org. | ||
| </code> | </code> | ||
| - | If you want to add multiple IP addresses, then add an extra ''ip4:'' rule to the existing record: | + | Allow a specific IP address to send mail: |
| <code> | <code> | ||
| - | v=spf1 a mx ip4:75.98.175.91 ip4:12.34.56.78 include:_spf.google.com ~all | + | v=spf1 ip4:208.111.40.179 -all |
| </code> | </code> | ||
| Line 43: | Line 57: | ||
| <code> | <code> | ||
| - | echo testing email | mail -r website@digitaltrike.com -s testing [mail-checker address] | + | echo testing email | mail -r website@domain.com -s testing [mail-checker address] |
| </code> | </code> | ||
