[cleanup] Remove DNS records pointing to postal or EC2

[captn3m0]

Plan:

It removes a lot of DNS entries pointing to dead or old infrastructure.

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  - destroy

Terraform will perform the following actions:

  - aws_route53_record.beta-cname

  - aws_route53_record.campaign-a

  - aws_route53_record.postal-a

  - aws_route53_record.postal-mx-a

  - aws_route53_record.postal-rp-a

  - aws_route53_record.postal-sf-a

  - aws_route53_record.psrp-cname

  - aws_route53_record.psrp-email-cname

  - aws_route53_record.routes-mx

  - aws_route53_record.speakforme-mx

  - aws_route53_record.storage-a


Plan: 0 to add, 0 to change, 11 to destroy.

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Note: You didn't specify an "-out" parameter to save this plan, so Terraform
can't guarantee that exactly these actions will be performed if
"terraform apply" is subsequently run.