public Task <MailboxFilterResult> CanDeliverToAsync(ISessionContext context, IMailbox to, IMailbox from, CancellationToken cancellationToken) { this.logger.LogDebug($"checking if we can deliver mail from {from.AsAddress()} to {to.AsAddress()}"); if (this.mailServerConfiguration.Domain.Equals(to.Host, StringComparison.InvariantCultureIgnoreCase) == true) { this.logger.LogInformation($"accepting email from {from.AsAddress()} to {to.AsAddress()}"); return(Task.FromResult(MailboxFilterResult.Yes)); } else { this.logger.LogInformation($"denying email from {from.AsAddress()} to {to.AsAddress()}"); return(Task.FromResult(MailboxFilterResult.NoTemporarily)); } }