public async Task <Alias> Add(Alias item)
        {
            var entry = await _context.Aliases.AddAsync(item)
                        .ConfigureAwait(false);

            await _context.SaveChangesAsync()
            .ConfigureAwait(false);

            return(entry.Entity);
        }
        public async Task <MailDomain> Add(MailDomain item)
        {
            var entry = await _context.Domains.AddAsync(item)
                        .ConfigureAwait(false);

            await _context.SaveChangesAsync()
            .ConfigureAwait(false);

            return(entry.Entity);
        }