Skip to main content

mpHighest

mpHighest = 0

Example​

procedure ConfigureUrgentMessage(Message: TIdMessage);
begin
  Message.Priority := mpHighest;
end;

Usage​

mpHighest selects Velox's highest mail-priority hint, generating urgent/high text headers and numeric X-Priority 1.

Additional Technical Info​

mpHighest is the strongest high-priority hint in TIdMessagePriority. Generation emits Priority: urgent, X-Priority: 1 and Importance: high.

The example is source-reviewed and is not executed by the documentation workflow.

Behavior and boundaries

  • A smaller enum ordinal means a higher priority; do not sort these values as though larger meant more important.
  • mpHighest and mpHigh share textual headers and differ only by X-Priority 1/2.
  • Receiving text containing urgent or high maps to this extreme member, while numeric first token 1 also maps here.
  • These nonuniform, advisory headers can be ignored, rewritten or used by filters. They do not change Velox execution, SMTP delivery or business severity.
  • This value does not set IMAP \Flagged and must not be used as a security or SLA control.

Header ownership

Normal generation derives headers from the enum and overwrites copied raw values. ExtraHeaders is appended later and can create contradictory duplicates; avoid combining it with the typed property.

Errors, performance and concurrency

Assignment is constant-time and side-effect free until generation. Message generation remains stateful and must not run concurrently with mutation.

Related entries

External references

Created 2026-07-15