Add attachment support

apps/web/src/lib/constants/ses-errors.ts

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+export const DELIVERY_DELAY_ERRORS = {
+  InternalFailure: "An internal Unsend issue caused the message to be delayed.",
+  General: "A generic failure occurred during the SMTP conversation.",
+  MailboxFull:
+    "The recipient's mailbox is full and is unable to receive additional messages.",
+  SpamDetected:
+    "The recipient's mail server has detected a large amount of unsolicited email from your account.",
+  RecipientServerError:
+    "A temporary issue with the recipient's email server is preventing the delivery of the message.",
+  IPFailure:
+    "The IP address that's sending the message is being blocked or throttled by the recipient's email provider.",
+  TransientCommunicationFailure:
+    "There was a temporary communication failure during the SMTP conversation with the recipient's email provider.",
+  BYOIPHostNameLookupUnavailable:
+    "Unsend was unable to look up the DNS hostname for your IP addresses. This type of delay only occurs when you use Bring Your Own IP.",
+  Undetermined:
+    "Unsend wasn't able to determine the reason for the delivery delay.",
+  SendingDeferral:
+    "Unsend has deemed it appropriate to internally defer the message.",
+};
+
+export const BOUNCE_ERROR_MESSAGES = {
+  Undetermined: "Unsend was unable to determine a specific bounce reason.",
+  Permanent: {
+    General:
+      "Unsend received a general hard bounce. If you receive this type of bounce, you should remove the recipient's email address from your mailing list.",
+    NoEmail:
+      "Unsend received a permanent hard bounce because the target email address does not exist. If you receive this type of bounce, you should remove the recipient's email address from your mailing list.",
+    Suppressed:
+      "Unsend has suppressed sending to this address because it has a recent history of bouncing as an invalid address. To override the global suppression list, see Using the Unsend account-level suppression list.",
+    OnAccountSuppressionList:
+      "Unsend has suppressed sending to this address because it is on the account-level suppression list. This does not count toward your bounce rate metric.",
+  },
+  Transient: {
+    General:
+      "Unsend received a general bounce. You may be able to successfully send to this recipient in the future.",
+    MailboxFull:
+      "Unsend received a mailbox full bounce. You may be able to successfully send to this recipient in the future.",
+    MessageTooLarge:
+      "Unsend received a message too large bounce. You may be able to successfully send to this recipient if you reduce the size of the message.",
+    ContentRejected:
+      "Unsend received a content rejected bounce. You may be able to successfully send to this recipient if you change the content of the message.",
+    AttachmentRejected:
+      "Unsend received an attachment rejected bounce. You may be able to successfully send to this recipient if you remove or change the attachment.",
+  },
+};